Question 1

Which of the following best describes the function of the bacterial cell wall?

Accepted Answer

It provides structural support and protects the cell from osmotic lysis.

Question 2

A patient is diagnosed with a bacterial infection. The bacteria are found to lack peptidoglycan in their cell walls. Which group do these bacteria most likely belong to?

Accepted Answer

Mycoplasma

Question 3

During a laboratory experiment, a student observes a bacterial growth curve. At which phase is the rate of cell division equal to the rate of cell death?

Accepted Answer

Stationary phase

Question 4

Which of the following equations correctly represents the calculation of bacterial population size after $$n$$ generations, starting from an initial population $$N_0$$?

Accepted Answer

$$N = N_0$ 	imes 2^n$$

Question 5

A hospital is experiencing an outbreak of a disease caused by a Gram-negative bacterium. Which structural feature is most likely contributing to the bacterium's resistance to certain antibiotics?

Accepted Answer

Presence of an outer membrane containing lipopolysaccharide (LPS)

Question 6

Which of the following best describes the role of enzymes in microbial metabolism?

Accepted Answer

Enzymes act as catalysts to speed up biochemical reactions without being consumed.

Question 7

A mutation occurs in a bacterial gene, resulting in a change from the codon UAU to UAA. What is the most likely consequence of this mutation?

Accepted Answer

A nonsense mutation leading to premature termination of translation

Question 8

Which of the following processes is responsible for the horizontal transfer of genetic material between bacteria via a bacteriophage?

Accepted Answer

Transduction

Question 9

A laboratory technician is tasked with sterilizing surgical instruments. Which method would be most effective for achieving sterilization?

Accepted Answer

Autoclaving at 121°C and 15 psi for 15 minutes

Question 10

Which of the following best explains why viruses are not considered living organisms?

Accepted Answer

They cannot reproduce independently outside a host cell.

Question 11

A patient is prescribed a broad-spectrum antibiotic. What is a potential risk associated with this treatment?

Accepted Answer

Destruction of normal microbiota, leading to opportunistic infections

Question 12

Which of the following is an example of a physical method of microbial control?

Accepted Answer

Irradiation with ultraviolet (UV) light

Question 13

A patient with a genetic immunodeficiency is unable to produce antibodies. Which component of the immune system is primarily affected?

Accepted Answer

Humoral immunity (AMI)

Question 14

Which of the following best describes the inflammatory response?

Accepted Answer

A nonspecific defense mechanism characterized by redness, heat, swelling, and pain

Question 15

A patient is exposed to a bacterial exotoxin. Which of the following is a likely effect of the exotoxin?

Accepted Answer

It directly damages host cells by disrupting specific cellular functions.

Question 16

Which of the following equations represents the Michaelis-Menten equation for enzyme kinetics?

Accepted Answer

$$v = \frac{V_{max} [S]}{K_m + [S]}$$

Question 17

A researcher is studying the effect of UV light on bacterial DNA. Which type of mutation is most commonly induced by UV exposure?

Accepted Answer

Formation of thymine dimers

Question 18

Which of the following best describes the difference between sterilization and disinfection?

Accepted Answer

Sterilization destroys all forms of microbial life, including spores; disinfection eliminates most pathogens but not necessarily spores.

Question 19

A patient receives a vaccine containing an inactivated virus. Which type of immunity is being stimulated?

Accepted Answer

Active artificial immunity

Question 20

In wastewater treatment, which microbial process is primarily responsible for the removal of organic matter?

Accepted Answer

Aerobic respiration by bacteria

BIO 175: Principles of Microbiology – Course Syllabus and Study Guide

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