Question 1

Which of the following best describes a virion?

Accepted Answer

A virus particle that exists outside the host cell and facilitates transmission between host cells.

Question 2

What is the primary function of the capsid in a virus?

Accepted Answer

To protect the viral genome and aid in transmission between host cells.

Question 3

A scientist observes a virus under an electron microscope and identifies repeating protein subunits forming the outer shell. What are these subunits called?

Accepted Answer

Capsomeres

Question 4

Which of the following statements about viral envelopes is correct?

Accepted Answer

Viral envelopes are derived from host cell membranes and surround the nucleocapsid in some viruses.

Question 5

Which of the following best distinguishes a naked virus from an enveloped virus?

Accepted Answer

A naked virus lacks a lipid envelope and consists only of a nucleocapsid.

Question 6

A patient is infected with a virus that can exist independently of a living host cell. What is the term for this form of the virus?

Accepted Answer

Virion

Question 7

Which of the following is the smallest morphological unit of a virus visible with an electron microscope?

Accepted Answer

Capsomere

Question 8

A virus is described as having a nucleocapsid. What does this term refer to?

Accepted Answer

The combination of the viral genome and the capsid.

Question 9

Which of the following is NOT a function of the viral capsid?

Accepted Answer

Replication of the viral genome.

Question 10

A researcher is studying a virus that contains only a protein coat and nucleic acid, with no additional outer layer. Which type of virus is this?

Accepted Answer

Naked virus

Question 11

Which of the following best explains why some viruses are more susceptible to disinfectants than others?

Accepted Answer

Enveloped viruses are more susceptible because their lipid envelopes can be disrupted by detergents and alcohols.

Question 12

A virus is found to have a highly repetitive pattern of protein molecules surrounding its nucleic acid. What is the biological significance of this arrangement?

Accepted Answer

It provides structural stability and protects the viral genome from environmental damage.

Question 13

Which of the following accurately describes the relationship between a capsid and a capsomere?

Accepted Answer

A capsid is composed of multiple capsomeres arranged in a precise pattern.

Question 14

A new antiviral drug is designed to disrupt the repetitive protein pattern of a virus. Which viral structure is this drug most likely targeting?

Accepted Answer

Capsid

Question 15

Which of the following equations best represents the relationship between the number of capsomeres ($$n) $$and the total number of protein molecules ($$p) in a $$viral capsid, if each capsomere is made up of $$k$$ protein molecules?

Accepted Answer

$$p = n 	imes k$$

Question 16

A virologist is comparing two viruses: Virus A has an envelope, while Virus B does not. Which of the following is a likely consequence of this structural difference?

Accepted Answer

Virus A is more sensitive to environmental factors such as drying and detergents.

Question 17

During a viral infection, which structure is responsible for recognizing and binding to host cell receptors?

Accepted Answer

Proteins embedded in the viral envelope or capsid.

Question 18

A virus is described as having a 'nucleocapsid.' Which of the following best describes this structure?

Accepted Answer

A complex of the viral genome and the capsid.

Question 19

Which of the following is a real-world implication of the difference between naked and enveloped viruses in terms of disease transmission?

Accepted Answer

Naked viruses are generally more stable in the environment and can be transmitted via surfaces, while enveloped viruses are more sensitive to desiccation.

Question 20

A virus is found to have a genome surrounded by a protein shell, but no lipid envelope. Which of the following best describes this virus?

Accepted Answer

It is a naked virus with a nucleocapsid structure.

Viral Structure and Classification: Microbiology Study Notes

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