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Viruses: Dead or Alive? Quiz

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Questions and Answers

Viruses are living cells.

False

What are the two main components of a virus's basic structure?

A protein coat and a nucleic acid core

What is the difference between DNA viruses and RNA viruses in terms of mutation rates?

DNA viruses are stable, RNA viruses mutate rapidly. (correct)

DNA viruses mutate rapidly, RNA viruses are stable.

Both DNA and RNA viruses mutate at the same rate.

There is no difference in their mutation rates.

The process of viral reproduction is referred to as the ______ cycle.

<p>lytic</p> Signup and view all the answers

Describe the steps involved in the lytic cycle.

<p>The lytic cycle begins with the virus attaching to the host cell's membrane and injecting its nucleic acid into the host cell. The viral nucleic acid then takes over the host cell's protein synthesis machinery, creating new viruses. The host cell then bursts, releasing the newly formed viruses.</p> Signup and view all the answers

What types of cells can viruses attack?

<p>All of the above</p> Signup and view all the answers

<h1>=</h1> <h1>=</h1> Signup and view all the answers

Study Notes

Viruses: Dead or Alive?

Viruses are not cells.
Viruses have a basic structure:
- Protein coat (highly antigenic)
- Nucleic acid core (RNA or DNA)
- Lipoprotein coat (only in enveloped viruses)

Virus Categories

DNA viruses are stable and do not mutate rapidly.
- Examples: Smallpox, Hepatitis B
RNA viruses mutate rapidly and are unstable.
- Examples: HIV, Rhinovirus

Are Viruses Alive?

Viruses exhibit only one characteristic of life: reproduction.
Viruses can only reproduce inside a host cell.
The process of viral reproduction is called the lytic cycle.

Lytic Cycle

A virus attaches to the host cell's membrane and injects its nucleic acid.
The viral nucleic acid takes over the host cell's protein synthesis, creating new viruses.
The host cell bursts, releasing newly formed viruses.

Cells Subject to Viral Attack

Viruses can attack animal cells, plant cells, bacterial cells, and human cells.

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Description

Test your knowledge on the characteristics and life cycle of viruses with this quiz. Explore the differences between DNA and RNA viruses, and understand the lytic cycle and how viruses reproduce within host cells. Ideal for students studying microbiology and virology.