Question 1

Which of the following best describes the main difference between biotechnology and recombinant DNA technology?

Accepted Answer

Biotechnology is the broad use of microorganisms for practical products, while recombinant DNA technology specifically alters genetic material for targeted purposes.

Question 2

Which tool is used to synthesize DNA or RNA probes that can locate specific nucleotide sequences in a sample?

Accepted Answer

Synthetic nucleic acids

Question 3

During the polymerase chain reaction (PCR), what is the purpose of heating the DNA to 94°C?

Accepted Answer

To denature the DNA strands by breaking hydrogen bonds

Question 4

Which of the following statements about restriction enzymes is TRUE?

Accepted Answer

They serve as a defense mechanism against invading viruses.

Question 5

A scientist wants to introduce a precise single-nucleotide mutation into a gene. Which technique should they use?

Accepted Answer

Site-directed mutagenesis

Question 6

Which of the following is a property of vectors used in genetic engineering?

Accepted Answer

They must contain a recognizable genetic marker.

Question 7

Which physical method of microbial control is most effective for sterilizing heat-sensitive solutions such as vaccines?

Accepted Answer

Filtration

Question 8

Which of the following best explains why nonenveloped viruses are generally more resistant to disinfectants than enveloped viruses?

Accepted Answer

Nonenveloped viruses have a protein capsid that is more resistant to environmental stressors.

Question 9

A hospital is testing a new disinfectant. Which method would best determine the minimum time required for the disinfectant to be effective against a specific bacterium?

Accepted Answer

Kelsey-Sykes capacity test

Question 10

Which of the following drugs is most effective against Mycobacterium species, according to the spectrum of activity chart?

Accepted Answer

Isoniazid

Question 11

Which of the following best describes the mechanism of action of beta-lactam antibiotics?

Accepted Answer

They prevent cross-linkage of NAM subunits in peptidoglycan, weakening the cell wall.

Question 12

Which of the following is a reason why there are fewer antifungal, antiprotozoan, and antihelminthic drugs compared to antibacterial drugs?

Accepted Answer

Fungi, protozoa, and helminths are eukaryotic and share more similarities with human cells.

Question 13

A patient is prescribed a combination of two antimicrobial drugs that enhance each other's effects. What is this interaction called?

Accepted Answer

Synergism

Question 14

Which of the following is a characteristic of a latent viral infection in animals?

Accepted Answer

The virus remains dormant in host cells and may reactivate later.

Question 15

Which of the following best describes the function of reverse transcriptase in retroviruses?

Accepted Answer

It synthesizes DNA from an RNA template.

Question 16

Which of the following is a correct pairing of a prokaryotic cell shape with its description?

Accepted Answer

Bacillus – rod-shaped

Question 17

Which of the following is a unique feature of archaea compared to bacteria?

Accepted Answer

Archaea have branched or ring-form hydrocarbon chains in their membrane lipids.

Question 18

Which of the following is a function of cyanobacteria in the environment?

Accepted Answer

They perform oxygenic photosynthesis and contribute to atmospheric oxygen.

Question 19

Which of the following is a correct statement about the difference between mutualism and commensalism?

Accepted Answer

In mutualism, both organisms benefit; in commensalism, one benefits and the other is unaffected.

Question 20

Which of the following best describes the role of a vector in the transmission of infectious diseases?

Accepted Answer

A vector is an animal that transmits pathogens from one host to another.

Microbiology Study Guide: Key Concepts and Visuals

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