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Chapter 21: Q5. (page 532)

The viral ________ play(s) a role in attaching a virion to the host cell.

a. core

b. capsid

c. envelope

d. both b and c

Short Answer

Expert verified

The viral capsid and envelope are involved in the virion's attachment to the host cell.

Step by step solution

01

Content Introduction

Viruses have plenty of shapes and sizes. They differ in terms of structure, replication mechanisms, and target hosts. Viruses infect nearly all forms of life, from bacteria and archaea to eukaryotes including plants, animals, and fungi.

02

Content Explanation

The viral envelope contains glycoproteins that are used to bind to host cells. Viruses with envelopes produce diseases such as chicken pox, influenza, and mumps. Due to the fragility of the envelope, non-enclosed viruses are more resistant to temperature, pH, and certain disinfectants than enveloped viruses.

A capsid is a protective coating of proteins that surrounds the nucleic acid genome of all virions. Some viral capsids have a simple polyhedral "sphere" structure, whereas others have a more complicated shape.

03

Final Answer

The correct option is D.

The viral capsid and envelope play(s) a role in attaching a virion to the host cell.

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Most popular questions from this chapter

In this section, you were introduced to different types of viruses and viral diseases. Briefly discuss the most interesting or surprising thing you learned about viruses.

The observation that the bacteria genus Chlamydia contains species that can only survive as intracellular parasites supports which viral origin hypothesis?

a. Progressive

b. Regressive

c. Self-replicating

d. Virus-first

Which statement is not true of viral replication?

a. A lysogenic cycle kills the host cell.

b. There are six basic steps in the viral replication cycle.

c. Viral replication does not affect host cell function.

d. Newly released virions can infect adjacent cells.

Which is true of DNA viruses?

a. They use the host cell鈥檚 machinery to produce new copies of their genome.

b. They all have envelopes.

c. They are the only kind of viruses that can cause cancer.

d. They are not important plant pathogens.

Prions are responsible for variant Creutzfeldt-Jakob Disease, which has resulted in over 100 human deaths in Great Britain during the last 10 years. How do humans contract this disease?
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