Question 1

Which of the following statements best describes the difference between Bacteria and Archaea?

Accepted Answer

Bacteria have peptidoglycan in their cell walls, while Archaea do not.

Question 2

Which domain includes organisms that evolved from cells that formed over three billion years ago and contains fungi, plants, animals, and protists?

Accepted Answer

Eukarya

Question 3

A scientist is trying to identify an unknown microorganism. Which resource would provide identification schemes for bacteria and archaea?

Accepted Answer

Bergey's Manual of Determinative Bacteriology

Question 4

Which of the following is TRUE regarding antibiotics?

Accepted Answer

Antibiotics only work on bacterial infections.

Question 5

Which of the following is a correct example of scientific nomenclature for the American Robin?

Accepted Answer

Turdus migratorius

Question 6

Which of the following statements about viruses is correct?

Accepted Answer

Viruses cannot be classified as living organisms because they lack cellular structure.

Question 7

A patient is diagnosed with a Gram-positive bacterial infection. Which cell wall component is most likely present?

Accepted Answer

Teichoic acid

Question 8

Which of the following methods is most effective for sterilizing heat-sensitive medical equipment?

Accepted Answer

Ethylene oxide gas

Question 9

Which of the following is a mechanical removal method for microbial control?

Accepted Answer

Filtration

Question 10

A researcher is using the Kirby-Bauer disk diffusion method. What is the primary purpose of this technique?

Accepted Answer

To determine the susceptibility of clinical isolates of bacteria to different antibiotics

Question 11

Which of the following statements about RT-PCR (Reverse Transcriptase Polymerase Chain Reaction) is correct?

Accepted Answer

RT-PCR is used to detect RNA viruses by converting RNA into DNA and amplifying it.

Question 12

Which of the following is a characteristic unique to Archaea compared to Bacteria and Eukarya?

Accepted Answer

Membrane lipids with ether linkages

Question 13

Which of the following is the correct formula for calculating the microbial death rate (D-value) given the initial population $$N_0$$ and the population after time $$t$$, $$N_t$$?

Accepted Answer

$$D = \frac{t}{\log N_0$ - \log N_t}$$

Question 14

A hospital is trying to prevent bacterial contamination in surgical rooms. Which term best describes the technique of preventing contamination?

Accepted Answer

Asepsis

Question 15

Which of the following is a real-world example of nonionizing radiation used for microbial control?

Accepted Answer

Ultraviolet (UV) light

Question 16

Which of the following statements about the microbial death curve is correct?

Accepted Answer

It will take longer to kill all members of a larger population than a smaller one.

Question 17

Which of the following is a correct application of the concept of selective toxicity in antibiotics?

Accepted Answer

Antibiotics target bacterial cell wall synthesis without harming human cells.

Question 18

Which of the following is a reason why boiling water is not always sufficient for sterilization?

Accepted Answer

Endospores must be killed with autoclave, as boiling may not destroy them.

Question 19

Which of the following is a correct statement about the use of PCR in microbiology?

Accepted Answer

PCR can amplify DNA of an unknown microorganism that cannot be cultured.

Microbiology Exam 2

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