WGU Clinical Microbiology Final Exam Rated A+
Describe the role of restriction enzymes in bacteria.
️️ Restriction enzymes cut DNA at specific sequences, helping bacteria defend against invading
viral DNA by degrading foreign genetic material.
What is a facultative anaerobe, and how doe...
Describe the role of restriction enzymes in bacteria.
✔️✔️ Restriction enzymes cut DNA at specific sequences, helping bacteria defend against invading
viral DNA by degrading foreign genetic material.
What is a facultative anaerobe, and how does it adapt to varying oxygen levels?
✔️✔️ A facultative anaerobe can grow with or without oxygen, using aerobic respiration when oxygen
is available and switching to anaerobic respiration or fermentation when it is absent.
Explain the concept of selective toxicity in antimicrobial drugs.
✔️✔️ Selective toxicity refers to an antimicrobial drug's ability to target and kill pathogens without
harming the host's cells, typically by exploiting differences in cell structure or metabolism.
How do halophiles survive in high-salt environments?
✔️✔️ Halophiles have specialized cellular mechanisms, such as high intracellular salt concentrations,
to balance osmotic pressure and stabilize proteins in high-salt environments.
What is the role of messenger RNA (mRNA) in protein synthesis?
✔️✔️ Messenger RNA (mRNA) carries genetic information from DNA to ribosomes, where it is
translated into specific amino acid sequences to form proteins.
How do retroviruses differ from other types of viruses?
✔️✔️ Retroviruses use reverse transcriptase to convert their RNA genome into DNA, which then
integrates into the host cell’s genome, allowing for long-term persistence.
What is the function of endospores in bacteria?
✔️✔️ Endospores allow bacteria to survive extreme conditions, such as heat, desiccation, and
chemical exposure, by entering a dormant and highly resistant state.
, Explain the concept of competitive inhibition in enzyme activity.
✔️✔️ Competitive inhibition occurs when a substance similar to the enzyme's substrate binds to the
active site, blocking the actual substrate from binding and slowing down the reaction.
How do obligate aerobes generate ATP?
✔️✔️ Obligate aerobes generate ATP through aerobic respiration, using oxygen as the final electron
acceptor in the electron transport chain, producing energy efficiently.
What is the purpose of streak plating in microbiology?
✔️✔️ Streak plating is a technique used to isolate individual bacterial colonies on an agar plate,
allowing for the identification of specific bacterial species.
Explain how DNA replication occurs in prokaryotic cells.
✔️✔️ In prokaryotic cells, DNA replication begins at a single origin of replication, where enzymes
unwind the DNA, and DNA polymerase synthesizes a new complementary strand for each original
strand.
What is the significance of bioaugmentation in environmental microbiology?
✔️✔️ Bioaugmentation involves adding specific microorganisms to contaminated environments to
accelerate the breakdown of pollutants, enhancing bioremediation efforts.
How do antibiotics that inhibit cell wall synthesis kill bacteria?
✔️✔️ Antibiotics that inhibit cell wall synthesis, like penicillin, prevent bacteria from forming a
functional cell wall, causing them to lyse and die due to osmotic pressure.
What is quorum sensing, and why is it important for bacterial populations?
✔️✔️ Quorum sensing is a communication mechanism that allows bacteria to sense and respond to
population density, coordinating activities like biofilm formation and virulence factor expression.
Describe the role of tRNA in protein synthesis.
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