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Are Viruses Alive? Basic Structure of Viruses

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Questions and Answers

What is the main reason viruses are not considered alive?

They lack cellular structure and metabolism. (correct)
They can replicate within a living host.
They have a protein coat called a capsid.
They carry both DNA and RNA.

Which of the following is NOT a component of a typical virus?

Genetic material
Cellular structure (correct)
RNA or DNA
Protein coat (capsid)

What is the function of a viral envelope?

To protect the virus from external factors
To help with viral reproduction
To aid in the virus's ability to infect host cells (correct)
To provide structural support to the virus

What differentiates RNA viruses from DNA viruses?

The type of genetic material they carry (D) Signup and view all the answers

What is the basic structure of a virus?

Genetic material and a protein coat (capsid) (A) Signup and view all the answers

Which statement best describes a bacteriophage?

A virus that infects and replicates within bacteria (B) Signup and view all the answers

Why are viruses considered obligate intracellular parasites?

They rely on the machinery of host cells to replicate (C) Signup and view all the answers

What is the host range of a virus?

The spectrum of host cells a virus can infect (B) Signup and view all the answers

Why must RNA viruses deliver special enzymes for cells to copy the viral genome?

Because host cells lack enzymes to copy RNA directly (D) Signup and view all the answers

How do vaccines work against viruses?

By stimulating the immune system to provide immunity (B) Signup and view all the answers

What is a zoonotic disease?

A disease that can be transmitted from animals to humans (B) Signup and view all the answers

Why are antibiotics ineffective against viruses?

Viruses lack cell walls targeted by antibiotics (C) Signup and view all the answers

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