Trivia On Organic Chemistry: MCQ Quiz!

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  • 1/32 Questions

    All organic compounds contain:

    • Nitrogen
    • Sulfur
    • Phosphorus
    • Carbon
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About This Quiz

Dive into the essentials of organic chemistry with this engaging MCQ quiz! Explore key concepts like the composition of organic compounds, the role of carbon, and the structure of macromolecules. Perfect for learners looking to solidify their understanding of organic chemistry fundamentals.

Trivia On Organic Chemistry: MCQ Quiz! - Quiz

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  • 2. 

    Which of the following elements is not found in carbohydrates?

    • Oxygen

    • Hydrogen

    • Carbon

    • Sulfur

    Correct Answer
    A. Sulfur
    Explanation
    Carbohydrates are organic compounds made up of carbon, hydrogen, and oxygen atoms. Sulfur is not typically found in carbohydrates. It is more commonly found in amino acids, proteins, and some vitamins. Therefore, sulfur is the element that is not found in carbohydrates.

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  • 3. 

    Monosaccharide means

    • Very fat

    • Single sugar

    • Many sugars

    • Very caloric

    Correct Answer
    A. Single sugar
    Explanation
    Monosaccharide refers to a single sugar molecule. It is the simplest form of carbohydrate and cannot be broken down further into smaller sugars. Monosaccharides are the building blocks of more complex carbohydrates like disaccharides and polysaccharides. Examples of monosaccharides include glucose, fructose, and galactose.

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  • 4. 

    What is another name for a protein made of many amino acids?

    • Monopeptide

    • Tripeptide

    • Dipeptide

    • Polypeptide

    Correct Answer
    A. Polypeptide
    Explanation
    A polypeptide is another name for a protein made of many amino acids. Proteins are formed by the bonding of amino acids through peptide bonds. A polypeptide chain consists of multiple amino acids joined together, forming a long chain. This chain then folds into a specific shape to create a functional protein. Therefore, the correct answer is polypeptide.

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  • 5. 

    Which type of proteins helps speed up chemical reactions?

    • Triglycerides

    • Enzymes

    • Glucose

    • Muscles

    Correct Answer
    A. Enzymes
    Explanation
    Enzymes are proteins that act as catalysts in chemical reactions, speeding up the rate of the reaction without being consumed in the process. They lower the activation energy required for the reaction to occur, allowing it to happen more quickly. Triglycerides are a type of fat molecule, glucose is a type of sugar, and muscles are made up of proteins, but none of these directly facilitate or speed up chemical reactions like enzymes do.

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  • 6. 

    An oil is_____________ at room temperature:

    • Liquid

    • Solid

    • Unstable

    • Sugar

    Correct Answer
    A. Liquid
    Explanation
    Oil is typically in a liquid state at room temperature. It does not solidify like some fats or become unstable. Additionally, sugar is not related to the state of oil at room temperature.

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  • 7. 

    Which group of organic compounds contains sugars and starches?

    • Carbohydrate

    • Salts

    • Nucleic acids

    • Lipid

    Correct Answer
    A. Carbohydrate
    Explanation
    Carbohydrates are the group of organic compounds that contain sugars and starches. They are the main source of energy for the body and play a crucial role in various biological processes. Carbohydrates are composed of carbon, hydrogen, and oxygen atoms, and they can be classified into simple sugars (monosaccharides), complex sugars (disaccharides and polysaccharides), and starches. They are found in various foods such as fruits, vegetables, grains, and dairy products.

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  • 8. 

    Which of the following are the most abundant elements found in organisms?

    • C,P,N,S

    • C,O,P,S

    • C,O,H,N

    • H,N,S,P

    Correct Answer
    A. C,O,H,N
    Explanation
    The most abundant elements found in organisms are carbon (C), oxygen (O), hydrogen (H), and nitrogen (N). These elements are essential for the structure and functioning of biological molecules such as carbohydrates, lipids, proteins, and nucleic acids. Carbon is the backbone of organic compounds, while oxygen and hydrogen are important for energy production and water molecules. Nitrogen is crucial for building proteins and nucleic acids, which are involved in various cellular processes. Therefore, C, O, H, and N are the most abundant elements in organisms.

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  • 9. 

    What are the two examples of nucleic acids?

    • Cholesterol and phospholipids

    • Lactase and sucrase

    • DNA and RNA

    • Lactose and sucrose

    Correct Answer
    A. DNA and RNA
    Explanation
    DNA and RNA are examples of nucleic acids. Nucleic acids are macromolecules that are involved in the storage, transmission, and expression of genetic information. DNA (deoxyribonucleic acid) is the genetic material that carries the instructions for the development and functioning of all living organisms. It is responsible for the inheritance of traits from one generation to another. RNA (ribonucleic acid) is involved in the synthesis of proteins based on the instructions provided by DNA. It plays a crucial role in gene expression and protein synthesis. Therefore, DNA and RNA are the correct examples of nucleic acids.

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  • 10. 

    Proteins contain which element that is not found in lipids or carbohydrates?

    • Oxygen

    • Nitrogen

    • Carbon

    • Hydrogen

    Correct Answer
    A. Nitrogen
    Explanation
    Proteins contain nitrogen, which is not found in lipids or carbohydrates. Nitrogen is an essential element for the structure and function of proteins, as it is present in the amino acids that make up proteins. Lipids and carbohydrates primarily consist of carbon, hydrogen, and oxygen, but do not contain nitrogen.

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  • 11. 

    Which of the following is not the main type of organic compound found in organisms?

    • Lipid

    • Carbohydrates

    • Salt

    • Protein

    Correct Answer
    A. Salt
    Explanation
    Salt is not considered a main type of organic compound found in organisms. Organic compounds are composed primarily of carbon atoms bonded to hydrogen atoms, while salt (such as sodium chloride) is an inorganic compound composed of ions. Organic compounds found in organisms include lipids, carbohydrates, and proteins, which play essential roles in various biological processes.

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  • 12. 

    Which element is found in nucleic acids but not proteins or lipids?

    • Hydrogen

    • Phosphorus

    • Nitrogen

    • Carbon

    Correct Answer
    A. Phosphorus
    Explanation
    Phosphorus is found in nucleic acids (DNA and RNA) as a key component of the phosphate groups in the backbone of the nucleic acid molecules. Proteins and lipids do not contain phosphorus in their structure. Hydrogen, nitrogen, and carbon are found in all three biomolecules - nucleic acids, proteins, and lipids.

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  • 13. 

    Waxes, fats, oils, and steroids are all:

    • Nucleic acids

    • Inorganic

    • Lipids

    • Carbohydrates

    Correct Answer
    A. Lipids
    Explanation
    Waxes, fats, oils, and steroids are all lipids. Lipids are a class of organic compounds that are insoluble in water but soluble in organic solvents. They are characterized by their hydrophobic nature and are important for various biological functions. Waxes, fats, oils, and steroids are all examples of lipids, each with their own unique structure and function in living organisms.

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  • 14. 

    What are the monomers that make up nucleic acids?

    • Fatty acids

    • Nucleotides

    • Amino acids

    • Monosaccharides

    Correct Answer
    A. Nucleotides
    Explanation
    Nucleic acids are composed of monomers called nucleotides. Nucleotides consist of three components: a sugar molecule (either ribose or deoxyribose), a phosphate group, and a nitrogenous base (adenine, guanine, cytosine, thymine, or uracil). These nucleotides join together through phosphodiester bonds to form the backbone of DNA or RNA molecules. Therefore, nucleotides are the correct answer as they are the building blocks of nucleic acids.

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  • 15. 

    What element characterizes amino acids?

    • Hydrogen

    • Oxygen

    • Nitrogen

    • Carbon

    Correct Answer
    A. Nitrogen
    Explanation
    Amino acids are characterized by the presence of nitrogen. Nitrogen is an essential component of amino acids, which are the building blocks of proteins. It is the nitrogen atom that distinguishes amino acids from other organic molecules, as it is responsible for the unique properties and functions of proteins in living organisms.

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  • 16. 

    Which of the following is not true about carbon?

    • It forms 4 bonds

    • It has 6 vanelce electrons

    • It forms single, double, and triple bonds

    • It has 4 valence electrons

    Correct Answer
    A. It has 6 vanelce electrons
  • 17. 

    Which of the following is not a role of lipids?

    • Used as chemical messengers

    • Transmit genetic information

    • Form barriers

    • Store energy

    Correct Answer
    A. Transmit genetic information
    Explanation
    Lipids are not involved in transmitting genetic information. Genetic information is typically transmitted through nucleic acids such as DNA and RNA. Lipids, on the other hand, have various roles such as serving as a source of energy, forming cell membranes and barriers, and acting as chemical messengers in signaling pathways.

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  • 18. 

    What are two compounds that contain carbon, but are considered to be inorganic?

    • Water and carbon dioxide

    • Water and carbon monixide

    • Methane and water

    • Carbon monoxide and carbon dioxide

    Correct Answer
    A. Carbon monoxide and carbon dioxide
    Explanation
    Carbon monoxide and carbon dioxide are considered to be inorganic compounds because they do not contain hydrogen atoms bonded to carbon. Inorganic compounds are typically defined as compounds that do not contain carbon-hydrogen (C-H) bonds. Both carbon monoxide (CO) and carbon dioxide (CO2) consist only of carbon and oxygen atoms, without any C-H bonds. On the other hand, methane (CH4) is an organic compound because it contains carbon atoms bonded to hydrogen atoms. Water (H2O) is also considered to be inorganic, as it does not contain carbon atoms at all.

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  • 19. 

    When 2 momnosaccharides join through dehydration synthesis, what happens?

    • Energy is lost

    • It is stored as fat

    • A disaccharide forms and water forms

    • A disaccharide forms but water is needed for it to happen

    Correct Answer
    A. A disaccharide forms and water forms
    Explanation
    When two monosaccharides join through dehydration synthesis, a disaccharide forms and water is also formed. Dehydration synthesis is a chemical reaction where water is removed, resulting in the formation of a larger molecule. In this case, the two monosaccharides combine to form a disaccharide, such as sucrose or lactose, and a molecule of water is released as a byproduct of the reaction. This process is important for the formation of complex carbohydrates in living organisms.

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  • 20. 

    The monomers that make up a lipid are?

    • Amino acids

    • Nucleotides

    • Monosaccharides

    • 3 fatty acids and a glycerold

    Correct Answer
    A. 3 fatty acids and a glycerold
    Explanation
    Lipids are a diverse group of biomolecules that include fats, oils, and waxes. They are composed of two main components: fatty acids and a glycerol molecule. Fatty acids are long hydrocarbon chains with a carboxyl group at one end, while glycerol is a three-carbon alcohol. The combination of three fatty acids and a glycerol molecule forms a triglyceride, the most common type of lipid. This arrangement allows lipids to store energy efficiently and serve as structural components of cell membranes. Lipids do not contain amino acids, nucleotides, or monosaccharides, which are the building blocks of proteins, nucleic acids, and carbohydrates, respectively.

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  • 21. 

    The main components of an amino acid are?

    • A sugar, an R group and an amino group

    • A nucleotide, 5-carbon sugar and an amino group

    • An amino group, an R group, and a carboxyl group

    • A 5-carbon sugar, and R group and hydrocarbon chain

    Correct Answer
    A. An amino group, an R group, and a carboxyl group
    Explanation
    The main components of an amino acid are an amino group, an R group, and a carboxyl group. The amino group consists of a nitrogen atom bonded to two hydrogen atoms, the R group is a variable side chain that gives each amino acid its unique properties, and the carboxyl group is a carbon atom double bonded to an oxygen atom and single bonded to a hydroxyl group. These components are essential for the structure and function of amino acids, which are the building blocks of proteins.

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  • 22. 

    A macromolecule is also known as a?

    • Monosaccharide

    • Polymer

    • Monomer

    • Fatty acid

    Correct Answer
    A. Polymer
    Explanation
    A macromolecule refers to a large molecule made up of smaller units called monomers. These monomers join together through chemical bonds to form a polymer. Therefore, a macromolecule is commonly known as a polymer. Monosaccharides are simple sugars and do not fit the definition of a macromolecule. Similarly, a monomer is a single unit that can join together to form a polymer, so it is not the same as a macromolecule. Fatty acids are a type of molecule but not specifically classified as macromolecules.

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  • 23. 

    How many amino acids are found in nature?

    • 1000

    • 20

    • 10

    • Millions

    Correct Answer
    A. 20
    Explanation
    There are 20 amino acids found in nature. Amino acids are the building blocks of proteins and are essential for various biological processes. These 20 amino acids differ in their chemical structures and properties, allowing them to contribute to the diverse functions of proteins. While there are other amino acids that can be synthesized or modified in the laboratory, the 20 amino acids commonly found in nature are the ones that are naturally occurring and are involved in the synthesis of proteins in living organisms.

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  • 24. 

    The following is ranked in order from smallest to largest:

    • Water molecule, carbon atom, monomer, polymer

    • Monomer, polymer, water molecule, carbon atom

    • Carbon atom, water molecule, monomer, polymer

    • Polymer, carbon atom, water molecule, monomer

    Correct Answer
    A. Carbon atom, water molecule, monomer, polymer
    Explanation
    The correct answer is carbon atom, water molecule, monomer, polymer. This is because a carbon atom is the smallest unit among the options given, followed by a water molecule which consists of two hydrogen atoms and one oxygen atom. A monomer is a single unit that can combine with other monomers to form a polymer, which is a larger molecule made up of repeating subunits. Therefore, the order from smallest to largest is carbon atom, water molecule, monomer, and polymer.

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  • 25. 

    All of the following are polysaccharides except?

    • Maltose

    • Starch

    • Cellulose

    • Glycogen

    Correct Answer
    A. Maltose
    Explanation
    Maltose is a disaccharide, not a polysaccharide. Polysaccharides are complex carbohydrates composed of multiple sugar units, while maltose is made up of only two glucose molecules. Starch, cellulose, and glycogen are examples of polysaccharides as they consist of long chains of glucose molecules.

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  • 26. 

    Which of the following is different between lipids and carbohydrates?

    • Lipids usually have 2 H atoms for every C atom

    • Carbohydrates store more energy than lipids and have a higher H to C ratio

    • Lipids store more energy than carbohydrates and have a higher H to C ratio

    • One contains nitrogen and the other does not

    Correct Answer
    A. Lipids store more energy than carbohydrates and have a higher H to C ratio
    Explanation
    Lipids and carbohydrates have different properties. Lipids store more energy than carbohydrates, making them a more efficient energy source. Additionally, lipids have a higher hydrogen to carbon (H:C) ratio compared to carbohydrates. This means that there are more hydrogen atoms relative to carbon atoms in lipids. This difference in energy storage and H:C ratio distinguishes lipids from carbohydrates.

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  • 27. 

    Which of the following is not a monosaccharide?

    • Galactose

    • Glucose

    • Sucrose

    • Frutose

    Correct Answer
    A. Sucrose
    Explanation
    Sucrose is not a monosaccharide because it is a disaccharide composed of glucose and fructose molecules. Monosaccharides are the simplest form of carbohydrates and cannot be broken down into smaller sugar units. Galactose, glucose, and fructose are all monosaccharides because they consist of a single sugar unit.

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  • 28. 

    Which of the following is true about saturated fats?

    • They contain the maximum number of hydrogens

    • They are commonly found in plants

    • They are considered to be "good" fat for your diet

    • They conatain several double bonds between carbons

    Correct Answer
    A. They contain the maximum number of hydrogens
    Explanation
    Saturated fats contain the maximum number of hydrogens. This means that each carbon atom in the fatty acid chain is bonded to as many hydrogen atoms as possible. This results in a straight and rigid structure, making saturated fats solid at room temperature. Examples of foods high in saturated fats include butter, lard, and fatty cuts of meat. Consuming excessive amounts of saturated fats is linked to an increased risk of heart disease and high cholesterol levels.

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  • 29. 

    A triglyceride is___________ at room temperature:

    • Sugar

    • Solid

    • Unstable

    • Liquid

    Correct Answer
    A. Solid
    Explanation
    Triglycerides are a type of fat molecule composed of three fatty acids attached to a glycerol backbone. At room temperature, most triglycerides are solid due to their high melting points. This is because they contain saturated fatty acids, which have straight chains and can pack tightly together. Solid triglycerides are typically found in foods like butter, lard, and coconut oil.

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  • 30. 

    A peptide bond is?

    • Van der waals forces

    • Covalent

    • Hydrogen bonding

    • Ionic

    Correct Answer
    A. Covalent
    Explanation
    A peptide bond is a covalent bond that forms between the carboxyl group of one amino acid and the amino group of another amino acid in a protein. Covalent bonds involve the sharing of electrons between atoms, which results in a strong and stable bond. In the case of a peptide bond, the carbon and nitrogen atoms involved share electrons, creating a strong bond that holds the amino acids together in a protein chain. Therefore, the correct answer is covalent.

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  • 31. 

    What type of bond holds two amino acids together?

    • Ionic

    • Hydrogen

    • Peptide

    • Cohesion

    Correct Answer
    A. Peptide
    Explanation
    When two amino acids are joined together in a protein, they form a peptide bond. This occurs through a dehydration synthesis reaction where the carboxyl group of one amino acid reacts with the amino group of another, releasing a molecule of water and creating a covalent bond. This bond specifically links the carbon atom of the carboxyl group to the nitrogen atom of the amino group, forming the backbone of protein structures.

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  • 32. 

    Which of the following can store energy or provide structural support in organisms?

    • Carbohydrates

    • Proteins

    • Nucleic acids

    • Lipids

    Correct Answer
    A. Carbohydrates
    Explanation
    Carbohydrates can store energy in the form of glucose, which is used by cells to produce ATP, the main energy currency of the cell. Additionally, carbohydrates can provide structural support in organisms by forming complex structures such as cellulose in plant cell walls and chitin in the exoskeleton of insects. Proteins also play a role in providing structural support, but they are primarily involved in enzymatic reactions, cell signaling, and transportation of molecules. Nucleic acids are responsible for storing and transmitting genetic information. Lipids, on the other hand, are mainly involved in energy storage and insulation rather than providing structural support.

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  • May 10, 2024
    Quiz Edited by
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  • Dec 14, 2009
    Quiz Created by
    Wlksoftball
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