$$\text{Mutation Rate} = \frac{\text{Number of Mutations}}{\text{Replication Cycle}}$$

$$\text{Viral RNA} \xrightarrow{\text{Reverse Transcriptase}} \text{DNA} \xrightarrow{\text{Integration}} \text{Host Genome}$$

$$\text{Viral DNA} \xrightarrow{\text{Host DNA Polymerase}} \text{Viral mRNA} \xrightarrow{\text{Translation}} \text{Viral Proteins}$$

Question 1

Which classification system groups viruses based on the relationship between their genome and messenger RNA?

Accepted Answer

Baltimore Classification System

Question 2

What is the correct order of viral structural components from smallest to largest?

Accepted Answer

Protomere → Capsomere → Capsid

Question 3

Which of the following best describes a nucleocapsid?

Accepted Answer

The association of viral capsid proteins with viral nucleic acid

Question 4

Which type of virus is most likely to rapidly evolve due to high mutation rates?

Accepted Answer

RNA viruses

Question 5

During the multiplication of bacteriophages, which step involves the irreversible binding of tail fibers to specific bacterial receptors?

Accepted Answer

Adsorption

Question 6

Which equation best represents the mutation rate of RNA viruses per replication cycle?

Accepted Answer

$$	ext{Mutation Rate} = \frac{	ext{Number of Mutations}}{	ext{Replication Cycle}}$$

Question 7

Which of the following is a possible effect of a viral infection that results in the transformation of a host cell into a malignant cancer cell?

Accepted Answer

Transforming infection

Question 8

Which DNA virus is most commonly used as a vector in gene therapy due to its stability outside the body?

Accepted Answer

Adenovirus

Question 9

Which RNA virus is responsible for the second most prevalent cause of the common cold and can cause SARS and COVID?

Accepted Answer

Coronavirus

Question 10

Which of the following statements correctly differentiates viroids from virusoids?

Accepted Answer

Viroids do not encode proteins, while virusoids have ribozyme activity and require helper viruses.

Question 11

Which of the following is NOT a morphological effect of viral infection on host cells?

Accepted Answer

Increased movement of ions

Question 12

Which virus family includes the causative agent of rabies and is characterized by a bullet-shaped, enveloped virion with a (-) ssRNA genome?

Accepted Answer

Rhabdoviruses

Question 13

What is the main difference between the release of enveloped and naked animal viruses from host cells?

Accepted Answer

Enveloped viruses are released by budding, naked viruses by lysis.

Question 14

Which of the following equations best represents the process of viral DNA integration into the host genome for Group VI viruses?

Accepted Answer

$$	ext{Viral RNA} \xrightarrow{	ext{Reverse Transcriptase}} 	ext{DNA} \xrightarrow{	ext{Integration}} 	ext{Host Genome}$$

Question 15

Which of the following is a characteristic of prions?

Accepted Answer

They are infectious proteins that cause other proteins to misfold.

Question 16

Which step in the animal virus multiplication cycle is targeted by antiviral drugs to prevent the release of viral nucleic acid?

Accepted Answer

Uncoating

Question 17

Which of the following viruses is associated with oncogenic transformation and cervical carcinomas?

Accepted Answer

Papillomavirus

Question 18

Which equation best represents the replication of DNA viruses using the host cell's machinery?

Accepted Answer

$$	ext{Viral DNA} \xrightarrow{	ext{Host DNA Polymerase}} 	ext{Viral mRNA} \xrightarrow{	ext{Translation}} 	ext{Viral Proteins}$$

Question 19

Which of the following is a genotoxic effect of viral infection?

Accepted Answer

DNA damage and mutations

Question 20

Which virus is the most common cause of respiratory illness and is unusually stable in unfavorable conditions?

Accepted Answer

Adenovirus

Chapter 5

Study Guide - Practice Questions