Question 1

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

Accepted Answer

They are unable to reproduce independently and require a host cell for replication.

Question 2

Which of the following is a unique feature of viroids compared to viruses?

Accepted Answer

Viroids consist solely of a short strand of circular RNA without a protein coat.

Question 3

During which stage of the viral life cycle does the viral genome enter the host cell?

Accepted Answer

Penetration

Question 4

A bacteriophage attaches to a bacterial cell and injects its DNA. Which step of the viral life cycle is this?

Accepted Answer

Penetration

Question 5

Which of the following best describes the function of the viral capsid?

Accepted Answer

It protects the viral nucleic acid from degradation.

Question 6

Which of the following equations best represents the exponential increase in viral particles during the synthesis phase, assuming each infected cell produces $$n$$ new viruses and $$x$$ cells are infected?

Accepted Answer

$$V = n 	imes x$$

Question 7

A patient is diagnosed with a prion disease. Which of the following best explains the nature of prions?

Accepted Answer

Prions are infectious proteins that cause misfolding of normal proteins in the brain.

Question 8

Which of the following is NOT a step in the general viral life cycle?

Accepted Answer

Photosynthesis

Question 9

A virus with an envelope is most likely to acquire it during which stage?

Accepted Answer

Release from the host cell

Question 10

Which of the following best describes the difference between the lytic and lysogenic cycles of bacteriophages?

Accepted Answer

The lytic cycle results in immediate destruction of the host cell, while the lysogenic cycle integrates viral DNA into the host genome.

Question 11

Which of the following is a common misconception about viruses?

Accepted Answer

Viruses can be treated with antibiotics.

Question 12

A scientist discovers a new infectious agent composed only of protein, with no nucleic acid. What is this agent most likely to be?

Accepted Answer

A prion

Question 13

Which of the following best explains why viruses are considered obligate intracellular parasites?

Accepted Answer

They can only reproduce inside a living host cell.

Question 14

Which of the following is a correct sequence of events in the viral life cycle?

Accepted Answer

Attachment → Penetration → Synthesis → Maturation → Release

Question 15

Which of the following best describes the role of reverse transcriptase in certain viruses?

Accepted Answer

It synthesizes DNA from an RNA template.

Question 16

A plant is infected by an agent that lacks a protein coat and consists only of a short strand of RNA. What is the most likely identity of this agent?

Accepted Answer

A viroid

Question 17

Which of the following is a key difference between viruses and bacteria?

Accepted Answer

Viruses lack cellular structure, while bacteria are cellular organisms.

Question 18

Which of the following best explains why prion diseases are difficult to treat?

Accepted Answer

Prions are resistant to standard sterilization methods and lack nucleic acids.

Question 19

A virus infects a host cell and causes the cell to burst, releasing new viral particles. Which term best describes this process?

Accepted Answer

Lytic cycle

Question 20

Which of the following best describes the process of viral maturation?

Accepted Answer

Assembly of viral components into complete virions.

Chapter 13: Viruses, Viroids, and Prions - Structured Study Notes

Study Guide - Practice Questions

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