If You Pass This Biology Test, You Are A Legit Biology Enthusiast!
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Biology is the natural science that studies life and living organisms, including their physical structure, chemical processes, molecular interactions, physiological mechanisms, development and evolution. Despite the complexity of the science, certain unifying concepts consolidate it into a single, coherent field. If you pass this biology test, you are a legit biology enthusiast!
- 1.
Organic compounds contain
- A.
Carbon and usually other elements
- B.
Many kinds of elements except carbon
- C.
Only carbon
- D.
Only carbon and hydrogen
Correct Answer
A. Carbon and usually other elementsExplanation
Organic compounds are characterized by the presence of carbon atoms. However, they also typically contain other elements such as hydrogen, oxygen, nitrogen, sulfur, and phosphorus. This is because carbon has the unique ability to form strong covalent bonds with a variety of other elements, allowing for the formation of diverse organic molecules with different functional groups. Therefore, the correct answer is that organic compounds contain carbon and usually other elements.Rate this question:
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- 2.
The number of covalent bonds a carbon atom can form with other atoms is
- A.
1
- B.
2
- C.
4
- D.
8
Correct Answer
C. 4Explanation
Carbon is a versatile element that can form four covalent bonds with other atoms. This is because carbon has four valence electrons in its outermost energy level, and it needs to share these electrons with other atoms to achieve a stable electron configuration. By forming four covalent bonds, carbon can complete its octet and satisfy the octet rule, which states that atoms tend to gain, lose, or share electrons to achieve a stable configuration with eight valence electrons. Therefore, the correct answer is 4.Rate this question:
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- 3.
A covalent bond formed when two atoms share two pairs of electrons is called a
- A.
Single bond
- B.
Double bond
- C.
Triple bond
- D.
Quadruple bond
Correct Answer
B. Double bondExplanation
A covalent bond is formed when two atoms share electrons. In a double bond, two pairs of electrons are shared between the atoms. This results in a stronger bond compared to a single bond where only one pair of electrons is shared. A triple bond involves sharing three pairs of electrons, while a quadruple bond involves sharing four pairs of electrons. Therefore, the correct answer is a double bond.Rate this question:
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- 4.
The breakdown of a polymer involves
- A.
Hydrolisis
- B.
A condensation reaction
- C.
The breaking of hydrogen bonds
- D.
The breaking of ionic bonds
Correct Answer
A. HydrolisisExplanation
The breakdown of a polymer involves hydrolysis, which is a chemical reaction that occurs when water molecules are used to break the bonds between the monomers in the polymer chain. This process results in the separation of the polymer into its individual monomer units. Hydrolysis is a common mechanism for the degradation of polymers and is often used in industrial processes to recycle or break down polymers for various applications.Rate this question:
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- 5.
ATP releases energy when
- A.
It undergoes a condensation reaction
- B.
A hydroxyl group is added to it
- C.
A phosphate group is added to it
- D.
A phosphate group is removed from it
Correct Answer
D. A pHospHate group is removed from itExplanation
ATP releases energy when a phosphate group is removed from it. This is because ATP (adenosine triphosphate) is a high-energy molecule that stores energy in its phosphate bonds. When one of these phosphate groups is removed through hydrolysis, ATP is converted into ADP (adenosine diphosphate), releasing energy in the process. This energy can be used by cells for various metabolic reactions and cellular processes.Rate this question:
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- 6.
Glycogen, starch, and cellulose are
- A.
Monosaccharides
- B.
Disaccharides
- C.
Polysaccharides
- D.
Simple sugars
Correct Answer
C. PolysaccharidesExplanation
Glycogen, starch, and cellulose are all examples of polysaccharides. Polysaccharides are complex carbohydrates made up of multiple monosaccharide units bonded together. In contrast to monosaccharides and disaccharides, which are smaller and simpler sugar molecules, polysaccharides are larger and more complex. Glycogen is the storage form of glucose in animals, starch is the storage form of glucose in plants, and cellulose is a structural component of plant cell walls. These polysaccharides play important roles in energy storage and structural support in living organisms.Rate this question:
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- 7.
The different shapes and funtions of different proteins are determined by
- A.
The R groups of the amino acids they contain
- B.
The amino groups of the amino acids they contain
- C.
The carboxyl groups of the amino acids they contain
- D.
Whether or not they contain any amino acids
Correct Answer
A. The R groups of the amino acids they containExplanation
The different shapes and functions of different proteins are determined by the R groups of the amino acids they contain. The R group, also known as the side chain, is a variable group that differs between different amino acids. It can be a simple hydrogen atom or a complex structure. The R group determines the chemical properties of the amino acid and plays a crucial role in protein folding and interactions. Therefore, the different combinations and arrangements of amino acids with their specific R groups contribute to the diverse structures and functions of proteins.Rate this question:
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- 8.
Most enxymes
- A.
Are changed by the reactions the catalyze
- B.
Increase the activation energy of the reactions they catalyze
- C.
Strengthen the chemical bonds in their substrate
- D.
Are sensitive to changes in temperature of pH
Correct Answer
D. Are sensitive to changes in temperature of pHExplanation
Enzymes are biological catalysts that speed up chemical reactions in living organisms. They are sensitive to changes in temperature and pH because these factors can affect the shape and structure of the enzyme. Temperature changes can alter the enzyme's activity by either increasing or decreasing its rate of reaction. Similarly, changes in pH can disrupt the ionic and hydrogen bonds that stabilize the enzyme's structure, leading to a loss of its catalytic activity. Therefore, enzymes are sensitive to changes in temperature and pH, making this the correct answer.Rate this question:
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- 9.
The large numbers of carbon hydrogen bonds in lipids
- A.
Make lipids polar
- B.
Store more energy than the carbon oxygen bonds in other organic compounds
- C.
Allow lipids to dissolve in water
- D.
Are found in the carboxyl group at the end of the lipid
Correct Answer
B. Store more energy than the carbon oxygen bonds in other organic compoundsExplanation
Lipids store more energy than the carbon oxygen bonds in other organic compounds because carbon-hydrogen bonds have a higher energy content than carbon-oxygen bonds. This is due to the difference in electronegativity between carbon and hydrogen, which leads to a more equal sharing of electrons and a stronger bond. As a result, lipids have a higher energy density and are able to store more energy per unit mass compared to other organic compounds with carbon-oxygen bonds.Rate this question:
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- 10.
The most important function of nucleic acids is
- A.
Catalyzing chemical reactions
- B.
Forming a barrier between the inside and outside of a cell
- C.
Storing energy
- D.
Storing information related to heredity and protein synthesis
Correct Answer
D. Storing information related to heredity and protein synthesisExplanation
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information in living organisms. They contain the instructions needed for the synthesis of proteins, which are essential for various cellular processes. Nucleic acids serve as the blueprint for the development, growth, and functioning of an organism. They carry the hereditary information from one generation to the next and play a crucial role in protein synthesis, ensuring that the correct proteins are produced at the right time and in the right amount. Therefore, the most important function of nucleic acids is storing information related to heredity and protein synthesis.Rate this question:
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- 11.
The atomic number of carbon is 6. Therefore, the number of protons in a carbon atom equals
- A.
3
- B.
6
- C.
7
- D.
12
Correct Answer
B. 6Explanation
The atomic number of an element represents the number of protons in the nucleus of an atom of that element. Since the atomic number of carbon is 6, it means that a carbon atom contains 6 protons. Therefore, the correct answer is 6.Rate this question:
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- 12.
One of the kinds of particles found in the nucleus of an atom is the
- A.
Proton
- B.
Electron
- C.
Ion
- D.
Boron
Correct Answer
A. ProtonExplanation
Protons are positively charged particles found in the nucleus of an atom. They have a mass of approximately 1 atomic mass unit and are essential for determining the identity of an element. Electrons, on the other hand, are negatively charged particles that orbit around the nucleus. Ions are atoms or molecules that have gained or lost electrons, resulting in a net positive or negative charge. Boron is an element and not a type of particle found in the nucleus. Therefore, the correct answer is proton.Rate this question:
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- 13.
The maximum number of electrons that can be held in the orbitals in an atom's second energy level is
- A.
2
- B.
4
- C.
6
- D.
8
Correct Answer
D. 8Explanation
The second energy level of an atom can hold a maximum of 8 electrons. This is determined by the formula 2n^2, where n is the principal quantum number. In the second energy level (n=2), the maximum number of electrons is 2(2^2) = 8. Each energy level has a specific number of orbitals and each orbital can hold a maximum of 2 electrons. Therefore, the second energy level can hold a maximum of 8 electrons.Rate this question:
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- 14.
Of the following elements, the one that is most likely to form ionic bonds is
- A.
Hydrogen
- B.
Carbon
- C.
Sodium
- D.
Oxygen
Correct Answer
C. SodiumExplanation
Sodium is the most likely element to form ionic bonds because it is a metal and tends to lose its outermost electron to achieve a stable electron configuration. This electron loss results in the formation of a positively charged sodium ion, which can then bond with negatively charged ions to form an ionic compound. Hydrogen, carbon, and oxygen are nonmetals and are more likely to form covalent bonds by sharing electrons rather than transferring them.Rate this question:
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- 15.
An example of a compound is
- A.
Water
- B.
Hydrogen gas
- C.
Oxygen gas
- D.
Chloride ion
Correct Answer
A. WaterExplanation
Water is an example of a compound because it is made up of two different elements, hydrogen and oxygen, combined chemically in a fixed ratio. It has distinct properties from its constituent elements and cannot be separated by physical means. Water molecules consist of two hydrogen atoms bonded to one oxygen atom, forming a stable compound with unique properties like its liquid state at room temperature and its ability to dissolve many substances.Rate this question:
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- 16.
The state of matter in which particles move most rapidly is
- A.
Liquid
- B.
Gas
- C.
Solid
- D.
Heat
Correct Answer
B. GasExplanation
Gas is the state of matter in which particles move most rapidly. In a gas, particles have high kinetic energy and move freely in all directions, colliding with each other and the walls of their container. This rapid movement is due to the weak intermolecular forces between gas particles, allowing them to easily overcome these forces and move quickly. In contrast, particles in liquids and solids have lower kinetic energy and are more closely packed together, resulting in slower movement. Heat, on the other hand, is not a state of matter but rather a form of energy transfer.Rate this question:
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- 17.
Every chemical reaction involves a
- A.
Change in the state of the matter in the reactants
- B.
Net release of energy
- C.
Transfer of energy
- D.
Transfer of electrons between atoms
Correct Answer
C. Transfer of energyExplanation
In every chemical reaction, energy is transferred between the reactants and products. This transfer of energy can occur in various forms, such as heat, light, or electricity. It is an essential part of the reaction as it determines the overall energy change in the system. This transfer of energy allows the reactants to break their bonds and form new bonds, resulting in the formation of products. Therefore, the correct answer is the transfer of energy.Rate this question:
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- 18.
Enzymes
- A.
Increase the amount of energy released in a reaction
- B.
Decrease the amount of energy released in a reaction
- C.
Catalyze only redox reactions
- D.
Reduce the activation energy needed for a reaction
Correct Answer
D. Reduce the activation energy needed for a reactionExplanation
Enzymes are biological catalysts that speed up chemical reactions in cells. They achieve this by reducing the activation energy required for a reaction to occur. Activation energy is the energy needed to break the existing bonds in the reactants and start the reaction. By lowering this energy barrier, enzymes enable reactions to occur more readily and at a faster rate. Therefore, the correct answer is that enzymes reduce the activation energy needed for a reaction.Rate this question:
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- 19.
In chemical reactions, the number of each kind of atom in the reactants is
- A.
The same as in the products
- B.
Less than in the products
- C.
More than in the products
- D.
B or c, depending on the kind of chemical reactions
Correct Answer
A. The same as in the productsExplanation
In chemical reactions, the law of conservation of mass states that matter cannot be created or destroyed, only rearranged. Therefore, the number of each kind of atom in the reactants must be the same as in the products. This is because the atoms in the reactants are rearranged to form new molecules in the products, but the total number of atoms remains constant.Rate this question:
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- 20.
Redox reactions
- A.
Involve either reduction of oxidation, but not both
- B.
Involve the transfer of electrons between atoms
- C.
Do not occur in living things
- D.
Always involve oxygen
Correct Answer
B. Involve the transfer of electrons between atomsExplanation
Redox reactions involve the transfer of electrons between atoms. In these reactions, one atom loses electrons (oxidation) while another atom gains those electrons (reduction). This transfer of electrons allows for the formation of new chemical bonds and the conversion of reactants into products. It is important to note that redox reactions can occur in both living and non-living systems and are not always dependent on the presence of oxygen.Rate this question:
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- 21.
The concentration of a solution is the mesaurement of the amount of
- A.
Acid dissolved in a fixed amount of a base
- B.
Solvent dissolved in a fixed amount of the solution
- C.
Solute dissolved in a fixed amount of the solution
- D.
Solvent dissolved in a fixed amount of the solute
Correct Answer
C. Solute dissolved in a fixed amount of the solutionExplanation
The concentration of a solution refers to the measurement of the amount of solute dissolved in a fixed amount of the solution. In other words, it is the ratio of the amount of solute to the volume or mass of the solution. This measurement helps determine the strength or intensity of a solution and is commonly expressed in units such as molarity, molality, or percent concentration.Rate this question:
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- 22.
When water dissociates, it forms
- A.
H+ ions and H2O
- B.
H+ ions and OH- ions
- C.
H+ ions and H3O+ ions
- D.
OH+ ions and H3O- ions
Correct Answer
B. H+ ions and OH- ionsExplanation
When water dissociates, it forms H+ ions and OH- ions. This is because water molecules can break apart into hydrogen ions (H+) and hydroxide ions (OH-) due to the ionization of water. The hydrogen ion (H+) is simply a proton, while the hydroxide ion (OH-) consists of one oxygen atom and one hydrogen atom with a negative charge. This process is essential in understanding the concept of acidity and basicity in chemistry, as the concentration of H+ and OH- ions determines the pH of a solution.Rate this question:
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- 23.
An acid is a solution with more
- A.
Hydronium ions than hydroxide ions
- B.
Hydroxide ions than hydronium ions
- C.
Sodium ions than hydroxide ions
- D.
Hydroxide ions than sodium ions
Correct Answer
A. Hydronium ions than hydroxide ionsExplanation
An acid is a solution with more hydronium ions than hydroxide ions. This is because acids are substances that release hydrogen ions (H+) when dissolved in water. These hydrogen ions combine with water molecules to form hydronium ions (H3O+). On the other hand, hydroxide ions (OH-) are found in basic solutions, which have a higher concentration of hydroxide ions than hydronium ions. Sodium ions are not directly related to the acidity or basicity of a solution.Rate this question:
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- 24.
An example of a base is
- A.
Pure water
- B.
Vinegar
- C.
Ammonia
- D.
Urine
Correct Answer
C. AmmoniaExplanation
Ammonia is an example of a base because it is a compound that can accept a proton or donate a pair of electrons. In water, ammonia can react with water molecules to form hydroxide ions, which are responsible for the basic properties of the solution. This reaction is known as hydrolysis. Additionally, ammonia has a bitter taste and feels slippery, which are common characteristics of bases.Rate this question:
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- 25.
A solution with a pH above 7 is
- A.
Logarithmic
- B.
Neutral
- C.
Acidic
- D.
Alkaline
Correct Answer
D. AlkalineExplanation
A solution with a pH above 7 is considered alkaline because pH is a measure of the acidity or alkalinity of a solution. A pH value above 7 indicates that the solution is more basic or alkaline in nature. The higher the pH value, the more alkaline the solution is. Therefore, an alkaline solution would have a pH above 7.Rate this question:
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- 26.
Biology is the study of
- A.
Animals
- B.
Plants and animals
- C.
All living things
- D.
Energy transfer
Correct Answer
C. All living thingsExplanation
Biology is the study of all living things. It encompasses the study of animals, plants, microorganisms, and any other form of life. By studying biology, scientists aim to understand the various processes and mechanisms that govern life, including growth, reproduction, metabolism, and evolution. This field of science helps us gain knowledge about the diversity of life on Earth and how living organisms interact with each other and their environment.Rate this question:
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- 27.
A short segment of DNA that contains instructions for the development of a single trait of an organism is known as a
- A.
DNA loop
- B.
Gene
- C.
Library
- D.
Membrane
Correct Answer
B. GeneExplanation
A gene is a short segment of DNA that contains instructions for the development of a single trait of an organism. It carries the genetic information that determines specific traits or characteristics, such as eye color or height. Genes are responsible for the production of proteins, which play a crucial role in the development and functioning of an organism.Rate this question:
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- 28.
As the cells in a multicellular organism multiply, they become specialized for different functions in a process called
- A.
Sexual reproduction
- B.
Descent with modification
- C.
Photosynthesis
- D.
Cell differentiation
Correct Answer
D. Cell differentiationExplanation
Cell differentiation is the process in which cells in a multicellular organism multiply and become specialized for different functions. This specialization allows cells to perform specific tasks and contribute to the overall functioning of the organism. Through cell differentiation, cells acquire distinct structures and functions that enable them to carry out specific roles in tissues and organs. This process is essential for the development and maintenance of complex organisms, as it ensures that each cell type performs its designated function effectively.Rate this question:
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- 29.
Homeostasis refers to the
- A.
Organization of cellular structures
- B.
Stable level of internal conditions in organisms
- C.
Organized structure of crystals
- D.
Destruction of tropical rain forests
Correct Answer
B. Stable level of internal conditions in organismsExplanation
Homeostasis refers to the stable level of internal conditions in organisms. It is a process by which living organisms maintain a constant internal environment despite external changes. This balance is crucial for the proper functioning of cells, tissues, and organs. Homeostasis is achieved through various physiological mechanisms such as temperature regulation, pH balance, and nutrient regulation. It ensures that essential processes like metabolism, growth, and reproduction occur within optimal conditions. Without homeostasis, organisms would be unable to survive and function properly.Rate this question:
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- 30.
Photosynthesis is part of a plant's
- A.
Metabolism
- B.
Homeostasis
- C.
Development
- D.
Response to stimuli
Correct Answer
A. MetabolismExplanation
Photosynthesis is the process by which plants convert sunlight into energy in the form of glucose. This energy is then used for various metabolic activities within the plant, such as growth, reproduction, and repair. Metabolism refers to all the chemical reactions that occur within an organism to maintain life, and photosynthesis is a key metabolic process for plants. Therefore, metabolism is the correct answer as it accurately describes the role of photosynthesis in a plant's overall functioning.Rate this question:
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- 31.
A tree of life explains
- A.
How organisms are relayed to each other
- B.
How organisms differ from each other
- C.
The lineages of various organisms
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
A tree of life is a visual representation that explains the relationships between different organisms. It shows how organisms are related to each other, highlighting their similarities and differences. Additionally, it depicts the lineages of various organisms, tracing their evolutionary history. Therefore, the correct answer is "all of the above" as a tree of life encompasses all these explanations.Rate this question:
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- 32.
Which of the following is not and important unifying theme in biology?
- A.
The diversity and unity of life
- B.
The relationship between organisms and society
- C.
The interdependence of living organisms
- D.
The evolution of life
Correct Answer
B. The relationship between organisms and societyExplanation
The relationship between organisms and society is not an important unifying theme in biology. Biology primarily focuses on the study of living organisms, their diversity, unity, interdependence, and evolution. While the relationship between organisms and society may have some relevance in fields like ecology and conservation, it is not a central theme in biology as it pertains more to the social sciences and humanities.Rate this question:
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- 33.
An example of a domain is
- A.
Animalia
- B.
Protista
- C.
Fungi
- D.
Eukarya
Correct Answer
D. EukaryaExplanation
The given options represent different domains of life. Animalia, protista, and fungi are all examples of kingdoms within the eukarya domain. Eukarya is one of the three domains of life, along with bacteria (prokarya) and archaea (archaebacteria). It includes all organisms that have cells with a nucleus and membrane-bound organelles. Therefore, eukarya is the correct answer as it represents a domain that includes a wide range of organisms such as animals, plants, fungi, and protists.Rate this question:
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- 34.
A trait that improves and individual's ability to survive and reproduce is a(n)
- A.
Mutation
- B.
Natural selection
- C.
Adaptation
- D.
Domain
Correct Answer
C. AdaptationExplanation
An adaptation is a trait that enhances an individual's ability to survive and reproduce in its specific environment. It is a result of natural selection, where individuals with advantageous traits are more likely to survive and pass on their genes to the next generation. Mutations, on the other hand, are random changes in an organism's DNA and may or may not result in adaptations. The term "domain" refers to a higher taxonomic rank in the classification of organisms and is not related to the concept of improving survival and reproduction.Rate this question:
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- 35.
Which of the following statements is true?
- A.
Destruction of rain forests has no effect on living things
- B.
Destruction of rain forests increases the rate of evolution of rainforest organisms
- C.
Humans have had no impact on the world's environment
- D.
Humans have had a large impact on the world's environment
Correct Answer
D. Humans have had a large impact on the world's environmentExplanation
The statement "Humans have had a large impact on the world's environment" is true because human activities such as deforestation, pollution, and climate change have significantly altered ecosystems, disrupted natural processes, and caused the extinction of numerous species. Human actions have led to habitat destruction, loss of biodiversity, and negative impacts on air, water, and soil quality. This has resulted in various environmental issues and challenges, highlighting the significant impact of humans on the world's environment.Rate this question:
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- 36.
A field biologist who studies the behavior of birds in a rain forest most likely collects data through
- A.
Experimenting
- B.
Modeling
- C.
Observing
- D.
Inferring
Correct Answer
C. ObservingExplanation
A field biologist studying bird behavior in a rainforest would most likely collect data through observing. This involves directly watching and recording the birds' actions and interactions in their natural habitat. Experimenting and modeling may not be practical or ethical in this context, as it could disrupt the birds' behavior or environment. Inferring may involve making assumptions or drawing conclusions based on limited information, which may not be as reliable as direct observation. Therefore, observing is the most suitable method for collecting data in this scenario.Rate this question:
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- 37.
Constructing a graph is an example of
- A.
Measuring
- B.
Organizing data
- C.
Obersving
- D.
Predicting
Correct Answer
B. Organizing dataExplanation
Constructing a graph involves arranging and categorizing data in a visual representation. It helps to organize data by presenting it in a structured and visual format, making it easier to interpret and analyze. By plotting data points on a graph, patterns, trends, and relationships within the data can be identified and understood more effectively. Therefore, constructing a graph is an example of organizing data.Rate this question:
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- 38.
Of the following steps in a scientific investigation, the last to be done is usually
- A.
Experimenting
- B.
Observing
- C.
Producing a model
- D.
Hypothesizing
Correct Answer
C. Producing a modelExplanation
Producing a model is typically the last step in a scientific investigation because it involves creating a representation or simulation of the phenomenon being studied based on the data and observations gathered during the experiment and observation phases. This allows scientists to further analyze and understand the underlying mechanisms and patterns of the phenomenon, and also enables them to make predictions and test hypotheses in a controlled manner. Therefore, producing a model is usually done after experimenting, observing, and hypothesizing, as it requires a solid foundation of data and knowledge.Rate this question:
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- 39.
A statement that exaplains observations and can be tested is called
- A.
A hypothesis
- B.
An inference
- C.
A theory
- D.
A model
Correct Answer
A. A hypothesisExplanation
A hypothesis is a statement that explains observations and can be tested. It is a proposed explanation or prediction that can be tested through experimentation or further observation. It is a tentative explanation that is based on existing evidence or knowledge. A hypothesis is an essential part of the scientific method, as it allows scientists to make predictions and design experiments to test those predictions.Rate this question:
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- 40.
A visual, verbal, or mathematical explanation that is supported by data is called
- A.
A hypothesis
- B.
An inference
- C.
A theory
- D.
A model
Correct Answer
D. A modelExplanation
A model is a visual, verbal, or mathematical explanation that is supported by data. It provides a representation or simulation of a real-world phenomenon or system. Models are used in various fields, such as science, economics, and engineering, to understand and predict how things work. They help to simplify complex concepts and make them easier to study and analyze. By incorporating data and observations, models can be tested and refined, improving our understanding of the subject matter. Therefore, a model is the correct answer for a visual, verbal, or mathematical explanation that is supported by data.Rate this question:
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- 41.
The ability of a microscope to show details clearly is called
- A.
Enlargement
- B.
Magnification
- C.
Reduction
- D.
Resolution
Correct Answer
D. ResolutionExplanation
Resolution refers to the ability of a microscope to clearly distinguish and show fine details of an object. It is a measure of the microscope's ability to produce a clear and sharp image, allowing the observer to see small structures and features with clarity. Magnification, on the other hand, refers to the degree to which an object is enlarged by the microscope. Reduction is the opposite of enlargement, where the object appears smaller. Therefore, resolution is the correct answer as it specifically relates to the clarity and level of detail that a microscope can provide.Rate this question:
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- 42.
One limitation of the scanning electron microscope is that is cannot be used to
- A.
Examine specimens smaller than cells
- B.
View living specimens
- C.
Produce an enlarged image of a specimen
- D.
Produce an image of the surface of a specimen
Correct Answer
B. View living specimensExplanation
The scanning electron microscope (SEM) uses a focused beam of electrons to create high-resolution images of the surface of a specimen. However, it cannot be used to view living specimens because the process of SEM requires the specimen to be in a vacuum and coated with a conductive material, which would kill any living organism. Therefore, the SEM is limited in its ability to observe dynamic biological processes or study living organisms.Rate this question:
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- 43.
A microscope with a 10X ocular lens and a 25X objective lens has a total power of magnification equal to
- A.
2.5x
- B.
35x
- C.
250x
- D.
2500x
Correct Answer
C. 250xExplanation
The total power of magnification in a microscope is calculated by multiplying the power of the ocular lens with the power of the objective lens. In this case, the ocular lens has a power of 10X and the objective lens has a power of 25X. Therefore, the total power of magnification is 10X * 25X = 250X.Rate this question:
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- 44.
The SI bade unit for time is the
- A.
Second
- B.
Minute
- C.
Hour
- D.
Day
Correct Answer
A. SecondExplanation
The SI base unit for time is the second. The second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom. It is a fundamental unit of measurement for time and is widely used in various fields such as physics, engineering, and everyday life.Rate this question:
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- 45.
The SI prefix that represents 1, 000 times the base unit is
- A.
Deci
- B.
Centi
- C.
Kilo
- D.
Micro
Correct Answer
C. KiloExplanation
The SI prefix "kilo" represents 1,000 times the base unit. This prefix is commonly used to denote a larger quantity or measurement. For example, kilogram represents 1,000 grams and kilometer represents 1,000 meters. Therefore, "kilo" is the correct answer in this case.Rate this question:
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