Question 1

Which of the following best describes why viruses are classified as nonliving microbes?

Accepted Answer

They lack cellular structure and cannot carry out metabolic processes on their own.

Question 2

A scientist is studying a virus with a helical capsid and an envelope. Which feature distinguishes this virus from a naked virus?

Accepted Answer

It acquires its envelope from the host cell membrane during budding.

Question 3

Which statement correctly compares prokaryotic and eukaryotic cells in the context of viral infection?

Accepted Answer

Both prokaryotic and eukaryotic cells can be infected by viruses, but the replication mechanisms differ.

Question 4

Which of the following best describes the lytic replication pathway of bacteriophages?

Accepted Answer

The phage immediately replicates, lyses the host cell, and releases new virions.

Question 5

A patient is diagnosed with Creutzfeldt-Jakob disease. Which agent is responsible for this condition, and how is it transmitted?

Accepted Answer

A prion; transmitted by ingestion of contaminated neural tissue.

Question 6

Which equation correctly calculates the generation time ($$g) $$for a bacterium given the number of generations ($$n) $$and the total time ($$t) in $$minutes?

Accepted Answer

$$g = \frac{t}{n}$$

Question 7

A microbiologist observes that a bacterial culture in a closed batch system enters a phase where cell division equals cell death. Which phase is this?

Accepted Answer

Stationary phase

Question 8

Which term describes microbes that thrive at temperatures above 80°C?

Accepted Answer

Hyperthermophiles

Question 9

A hospital is selecting a germicide for sterilizing surgical instruments. Which level of germicidal activity is required?

Accepted Answer

High-level

Question 10

Which of the following is a correct definition of an opportunistic pathogen?

Accepted Answer

A microbe that causes disease only when the host's defenses are compromised.

Question 11

Which equation represents the calculation of the total number of bacteria ($$N) $$after $$n$$ generations, starting from an initial population ($$N_0$$)?

Accepted Answer

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

Question 12

A patient contracts a disease after eating undercooked beef contaminated with E. coli. Which type of transmission is this?

Accepted Answer

Indirect transmission via a vehicle

Question 13

Which of the following best describes the role of surveillance in epidemiology?

Accepted Answer

It tracks the occurrence and spread of diseases to inform public health interventions.

Question 14

Which of the following is a primary goal of epidemiology?

Accepted Answer

To identify and control factors that influence the spread of disease.

Question 15

A virus is classified as oncogenic. What does this mean?

Accepted Answer

It can induce cancer in the host.

Question 16

Which of the following best explains why RNA viruses tend to evolve faster than DNA viruses?

Accepted Answer

RNA viruses have higher mutation rates due to lack of proofreading during replication.

Question 17

A water treatment facility uses filtration to remove microbes. Which type of filtration is most effective for removing bacteria?

Accepted Answer

Filtration with pore sizes of 0.2 micrometers

Question 18

Which of the following is NOT a stage in the typical infectious disease progression?

Accepted Answer

Photosynthetic period

Question 19

A new disease emerges in a population and spreads rapidly across multiple countries. How is this event best classified?

Accepted Answer

Pandemic

Question 20

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

Accepted Answer

Sterilization destroys all forms of microbial life, while disinfection reduces the number of pathogenic microbes.

Microbiology Study Guide: Viruses, Microbial Growth, Infectious Diseases, and Epidemiology

Study Guide - Practice Questions

Study Guide - Flashcards