Question 1

Which of the following best describes the role of reverse transcriptase in the production of recombinant human gene products in bacteria?

Accepted Answer

It synthesizes DNA from an RNA template, allowing the creation of complementary DNA (cDNA) for insertion into bacterial vectors.

Question 2

During the polymerase chain reaction (PCR), which step involves the attachment of primers to single-stranded DNA, and at what temperature does this typically occur?

Accepted Answer

Priming at $$60^\circ \mathrm{C}$$

Question 3

A scientist wants to identify a suspect in a crime using DNA fingerprinting. Which technique would be most appropriate for separating DNA fragments by size, shape, and electrical charge?

Accepted Answer

Gel electrophoresis

Question 4

Which of the following is NOT a characteristic of an ideal antimicrobial agent?

Accepted Answer

It is highly toxic to both pathogens and host cells.

Question 5

A hospital is trying to inactivate bacterial endospores on surgical instruments. Which physical method should they use?

Accepted Answer

Autoclaving (high heat and pressure)

Question 6

Which of the following microbes is most resistant to antimicrobial agents?

Accepted Answer

Prions

Question 7

A patient is prescribed a broad-spectrum antibiotic. Which of the following best describes the action of this drug?

Accepted Answer

It is effective against many different types of organisms.

Question 8

Which mechanism allows bacteria to survive exposure to antibiotics by pumping the drug out of the cell before it can act?

Accepted Answer

Efflux pumps

Question 9

A researcher is using a restriction enzyme to cut DNA at specific sites. Which property makes restriction enzymes useful in recombinant DNA technology?

Accepted Answer

They recognize and cut DNA at unique restriction sites.

Question 10

Which of the following best defines selective toxicity in antimicrobial therapy?

Accepted Answer

The drug is more toxic to the pathogen than to the host.

Question 11

Which group of antimicrobial agents has the fewest available drugs, and why?

Accepted Answer

Antivirals, because it is difficult to treat viral infections without harming the host.

Question 12

A patient develops an infection after surgery due to improper sterilization of instruments. What is the term for this type of infection?

Accepted Answer

Iatrogenic infection

Question 13

Which of the following best describes the difference between incidence and prevalence in epidemiology?

Accepted Answer

Incidence is the number of new cases; prevalence is the total number of cases (old and new).

Question 14

A disease occurs at a relatively stable frequency within a given area or population. What is this pattern called?

Accepted Answer

Endemic

Question 15

Which of the following is an example of a biological vector in disease transmission?

Accepted Answer

A mosquito transmitting malaria

Question 16

Which portal of entry is most likely involved when a pathogen crosses the placenta to infect a fetus?

Accepted Answer

Placenta

Question 17

Which of the following is an example of microbial antagonism?

Accepted Answer

Competition between normal microbiota and pathogens for nutrients

Question 18

A patient is exposed to a mutagen. What is the most likely effect on their DNA?

Accepted Answer

Heritable changes in the nucleotide sequence

Question 19

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

Accepted Answer

Inhibition of cell wall synthesis

Question 20

A patient is diagnosed with a nosocomial infection. Which of the following best describes how this infection was acquired?

Accepted Answer

It was acquired in a healthcare facility.

Microbiology Study Guide: Recombinant DNA, Microbial Control, Antimicrobial Drugs, and Epidemiology

Study Guide - Practice Questions

Study Guide - Flashcards