The Study Of Bacteria

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  • 1/25 Questions

    What are the most numerous organisms on Earth?

    • Earth worms
    • Bacteria
    • People
    • Dogs
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About This Quiz

Explore the microbial world with 'The Study of Bacteria'. This quiz assesses your understanding of bacteria, their ecological roles, and biochemical processes. Key topics include bacterial abundance, chemosynthesis at deep ocean vents, and the properties of acids and blood pH levels.

The Study Of Bacteria - Quiz

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  • 2. 

    Control of pH is vital to organisms.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    pH is a measure of the acidity or alkalinity of a solution. Organisms have specific pH ranges in which they can function optimally. Deviations from this range can disrupt cellular processes and lead to detrimental effects. Therefore, maintaining control over pH levels is crucial for the survival and well-being of organisms.

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  • 3. 

    A change in pH does not indicate a reaction.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    A change in pH does indicate a reaction. pH is a measure of the acidity or alkalinity of a solution, and it can change as a result of a chemical reaction. When a reaction occurs, it can produce or consume hydrogen ions (H+) or hydroxide ions (OH-), which in turn affects the pH of the solution. Therefore, a change in pH can be an indication that a reaction has taken place.

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  • 4. 

    Diplococci are ________ that live in pairs.

    • Cocci

    • Bacillus

    • Spirochetes

    Correct Answer
    A. Cocci
    Explanation
    Diplococci are bacteria that live in pairs.

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  • 5. 

    According to your notes, for what reason do we test bacteria?

    • To kill time

    • To get good grades

    • So we can kill them

    • To identify their species

    Correct Answer
    A. To identify their species
    Explanation
    We test bacteria to identify their species. By conducting tests, we can determine the specific type of bacteria present, which is crucial for understanding its characteristics, behavior, and potential impact on human health or the environment. Identifying the species helps in developing appropriate treatment strategies, prevention measures, and further research.

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  • 6. 

    A 'staph' or 'staphylo' bacteria is a bacteria that is/are

    • In pairs

    • In chains

    • In clumps

    • By themselves

    Correct Answer
    A. In clumps
    Explanation
    Staphylo bacteria are known to form clusters or clumps. This means that they tend to group together, forming a characteristic clumpy appearance. Unlike bacteria that form pairs or chains, staphylo bacteria prefer to exist in clumps. This clustering behavior is a distinguishing feature of staphylo bacteria and helps in their identification and classification.

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  • 7. 

    What is an obligate Aerobe?

    • It requires Oxygen

    • It can not live in the presence of oxygen

    • It can live with or without oxygen

    Correct Answer
    A. It requires Oxygen
    Explanation
    An obligate aerobe is an organism that requires oxygen for its survival and growth. This means that it cannot live or carry out its metabolic processes in the absence of oxygen. These organisms have specific enzymes and metabolic pathways that are dependent on oxygen to produce energy. Without oxygen, they are unable to generate enough energy to sustain their life. Therefore, the correct answer is "It requires Oxygen."

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  • 8. 

    Cocci are:

    • Rod shaped

    • Spherical

    • Corkscrew shaped

    Correct Answer
    A. Spherical
    Explanation
    Cocci are spherical in shape. This means that they have a round or oval appearance when viewed under a microscope. Unlike rod-shaped bacteria (bacilli) or corkscrew-shaped bacteria (spirochetes), cocci have a distinct rounded shape. This shape is important in identifying and classifying different types of bacteria.

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  • 9. 

    The normal pH level of blood is

    • 1.5 - 3.5

    • 3.759 - 5. 254

    • 7.35 - 7.45

    • 10.9 - 10.7

    Correct Answer
    A. 7.35 - 7.45
    Explanation
    The normal pH level of blood is 7.35 - 7.45. This range is considered normal because it indicates a slightly alkaline condition, which is necessary for the proper functioning of various physiological processes in the body. Maintaining this pH range is crucial for enzymes, proteins, and other molecules to function optimally. Any deviation from this range can lead to acidosis or alkalosis, which can disrupt normal bodily functions and potentially be life-threatening. Therefore, it is important to maintain the blood pH within this narrow range for overall health and well-being.

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  • 10. 

    Why is it important to keep the media covered?

    • To stop the media from drying out.

    • So agar doesn't leak out.

    • To prevent contamination.

    • To stop the smell of bacteria from getting out.

    Correct Answer
    A. To prevent contamination.
    Explanation
    It is important to keep the media covered to prevent contamination. When the media is left uncovered, it is exposed to the environment which can lead to the introduction of unwanted microorganisms. These microorganisms can contaminate the media and interfere with the growth of the desired bacteria or other organisms. By keeping the media covered, the risk of contamination is reduced, ensuring that the growth conditions remain optimal and accurate results can be obtained.

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  • 11. 

    Enzymes can be used to determine the species of a bacteria.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Enzymes can be used to determine the species of a bacteria because different species of bacteria produce different types and amounts of enzymes. By testing for the presence and activity of specific enzymes, it is possible to identify the species of bacteria present. This is commonly done in microbiology laboratories using techniques such as enzyme assays or molecular methods like polymerase chain reaction (PCR). Therefore, the statement "Enzymes can be used to determine the species of a bacteria" is true.

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  • 12. 

    Deep Ocean Vents give off:

    • Sulfur, for chemosynthetic organisms

    • Light, for photosynthetic organisms

    • Light, for bioluminescent organisms

    • Radioactivity

    Correct Answer
    A. Sulfur, for chemosynthetic organisms
    Explanation
    Deep ocean vents give off sulfur, which is used by chemosynthetic organisms as a source of energy for their metabolic processes. Chemosynthetic organisms are able to convert the sulfur compounds released from the vents into organic molecules, providing them with the necessary nutrients to survive in this extreme environment. This process is similar to photosynthesis, but instead of using sunlight as an energy source, chemosynthetic organisms utilize the chemical energy from sulfur compounds.

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  • 13. 

    A 'strep' or 'strepto' bacteria is a bacteria that is/are:

    • In pairs

    • In chains

    • In clumps

    • By themselves

    Correct Answer
    A. In chains
    Explanation
    A 'strep' or 'strepto' bacteria is a bacteria that is found in chains. This means that the individual bacteria cells are connected to each other in a linear arrangement, forming a chain-like structure. This characteristic arrangement can be observed under a microscope and is used to classify certain types of bacteria.

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  • 14. 

    Cells use _____ to ferment carbohydrates.

    • Acids

    • Ribosomes

    • Enzymes

    • Alcohol

    Correct Answer
    A. Enzymes
    Explanation
    Cells use enzymes to ferment carbohydrates. Enzymes are biological catalysts that speed up chemical reactions in cells. In the process of fermentation, enzymes break down carbohydrates into simpler molecules, such as alcohol or acids, to produce energy. Therefore, enzymes are essential for the fermentation of carbohydrates in cells.

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  • 15. 

    An example of a Gram Positive bacteria is a _____, and an example of a gram negative bacteria would be _____.

    • S. aureus, B. subtilis

    • S. aureus, E. coli

    • E. coli, P. mirabilis

    Correct Answer
    A. S. aureus, E. coli
    Explanation
    Gram positive bacteria have a thick peptidoglycan layer in their cell wall, which retains the crystal violet stain used in the Gram staining technique. S. aureus is a well-known example of a Gram positive bacterium. On the other hand, Gram negative bacteria have a thin peptidoglycan layer and an outer membrane, which does not retain the stain, making them appear pink or red after the counterstain. E. coli is a commonly studied Gram negative bacterium. Therefore, the correct answer is S. aureus, E. coli.

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  • 16. 

    A base has extra:

    • H+ ions

    • H2O ions

    • OH- ions

    • H- ions

    • H- ions

    Correct Answer
    A. OH- ions
    Explanation
    A base has extra OH- ions. In a solution, when a base dissolves, it releases OH- ions into the solution. These OH- ions are responsible for the basic properties of the solution, such as the ability to neutralize acids. Therefore, the presence of OH- ions indicates the presence of a base.

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  • 17. 

    Bacteria do not have have:

    • Cell Walls

    • Ribosomes

    • Cell Membranes

    • Membrane Bound Organelles

    • Non-Membrane Bound Organelles

    Correct Answer
    A. Membrane Bound Organelles
    Explanation
    Bacteria do not have membrane-bound organelles. Unlike eukaryotic cells, which have specialized compartments enclosed by membranes, bacteria lack these structures. Instead, their cellular functions occur within the cytoplasm, which is not divided into distinct organelles. Bacteria do have cell walls, ribosomes, cell membranes, and non-membrane bound organelles, but they do not possess membrane-bound organelles like mitochondria, Golgi apparatus, or endoplasmic reticulum.

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  • 18. 

    A/An _____ media will allow some bacteria to grow and slow the growth of other bacteria.

    • Enriched

    • Differential

    • Selective

    • Assay

    Correct Answer
    A. Selective
    Explanation
    Selective media are designed to encourage the growth of certain types of bacteria while inhibiting the growth of others. This is achieved by incorporating specific ingredients or chemicals into the media that target and suppress the growth of unwanted bacteria. By selectively promoting the growth of desired bacteria, selective media can be used to isolate and identify specific bacterial species or strains. Therefore, a selective media will allow some bacteria to grow while slowing the growth of other bacteria.

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  • 19. 

    An Acid has extra:

    • H2O ions

    • OH- ions

    • OH+ ions

    • H- ions

    • H+ ions

    Correct Answer
    A. H+ ions
    Explanation
    An acid is a substance that donates protons (H+) when dissolved in water. Therefore, the correct answer is H+ ions, as acids release hydrogen ions into the solution.

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  • 20. 

    Something that is sterile:

    • Is red

    • Is brown

    • Is new

    • Is free of bacteria and viruses

    • Is free of bacteria, viruses, and cells

    Correct Answer
    A. Is free of bacteria, viruses, and cells
    Explanation
    The correct answer is "is free of bacteria, viruses, and cells." Sterile refers to something that is completely free of any living organisms, including bacteria, viruses, and cells. This means that it is completely clean and devoid of any microorganisms that could cause contamination or infection.

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  • 21. 

    Which reagent must only be used for 15 seconds?

    • Crystal Violet

    • Iodine

    • Safranin

    • Alcohol

    Correct Answer
    A. Alcohol
    Explanation
    Alcohol must only be used for 15 seconds because it is a decolorizing agent in the Gram staining process. After applying crystal violet and iodine, alcohol is used to wash away the excess stain from the Gram-negative bacteria. However, if alcohol is left on for too long, it can also remove the crystal violet stain from the Gram-positive bacteria, resulting in a false negative result. Therefore, it is crucial to limit the exposure of alcohol to 15 seconds to ensure accurate Gram staining results.

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  • 22. 

    The order for making a gram stain is:

    • Smear, use reagent, heat fix, cool, air dry

    • Smear, heat fix, cool, use reagent, air dry

    • Smear, air dry, heat fix, cool, use reagent

    • Heat fix, cool, use reagent, air dry, smear

    Correct Answer
    A. Smear, air dry, heat fix, cool, use reagent
    Explanation
    The correct order for making a gram stain is to first create a smear of the sample. Then, allow the smear to air dry, which helps to fix the cells in place. After air drying, the smear is heat fixed by passing it through a flame, which kills the cells and adheres them to the slide. Once heat fixed, the slide is allowed to cool down. Finally, a reagent is applied to the smear, which helps to differentiate between gram-positive and gram-negative bacteria. Therefore, the correct order is smear, air dry, heat fix, cool, use reagent.

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  • 23. 

    What is the only food chain know that does not depend on the sun?

    • Deep Ocean Vents

    • Deep Ocean Trenches

    • Aquariums

    • The Rainforest

    Correct Answer
    A. Deep Ocean Vents
    Explanation
    Deep Ocean Vents is the correct answer because unlike other food chains that rely on photosynthesis, Deep Ocean Vents are located in complete darkness and extreme pressure, where sunlight cannot reach. Instead, these ecosystems depend on chemosynthesis, a process where bacteria use chemicals from the vents to produce energy. This unique food chain is sustained by organisms that feed on these bacteria, forming a complex ecosystem that does not rely on the sun.

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  • 24. 

    A mesophile would most likely thrive:

    • On a computer keyboard

    • Near a deep ocean vent

    • In the Arctic Ocean

    • In the Sahara desert

    Correct Answer
    A. On a computer keyboard
    Explanation
    A mesophile is an organism that thrives in moderate temperature ranges. A computer keyboard typically operates at room temperature, which falls within the mesophilic range. Therefore, a mesophile would most likely thrive on a computer keyboard.

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  • 25. 

    Pathogens need _____ in the media to thrive.

    • HDL

    • LDL

    • SBA

    • TSI

    Correct Answer
    A. SBA
    Explanation
    Pathogens need specific nutrients in the media to thrive. SBA, which stands for Sheep Blood Agar, is a type of culture medium that contains essential nutrients for the growth and survival of pathogens. This medium is commonly used in microbiology laboratories to support the growth of bacteria and identify their characteristics. Therefore, SBA provides the necessary components for pathogens to thrive and multiply.

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  • Current Version
  • Feb 25, 2025
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 28, 2009
    Quiz Created by
    Westernwishes
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