Viruses

The outer protein coat of a virus is called a

• DNA core.

• capsid.

• bacteriophages.

• endospores.

What is the basic structure of a virus?

• DNA or RNA surrounded by a protein coat.

• a capsid surrounded by a protein coat.

• a tail sheath surrounded by tail

• a tiny cell surrounded by a cell.

Viruses are prokaryotes?

• True

• False

Answer explanation

Viruses are non living. A prokaryote is a cell without a nucleus.

Viruses are ______________

• producers.

• consumers.

• parasites.

• decomposers.

The study of viruses is a part of biology because

• they belong to the kingdom Eubacteria

• they are about to become extinct.

• they are living organisms.

• they are active inside living cells.

Which occurs during the lysogenic cycle of a virus infection?

• Viral genes instruct the host cell to make more viral protein capsids and enzymes needed for viral replication.

• The virus produces active, immediate infections.

• The virus takes over the cell, makes copies of itself, and usually kills the host cell.

• The viral genes become a part of the host cell DNA, so the cell continually makes more copies of the virus.

What do viruses have in common with living cells? They both...

• store genetic information
• have chloroplasts
• use glucose for cellular respiration
• have endoplasmic reticulum

What is the first step of the virus reproduction cycle?

• The viruses genetic material (DNA) starts to take over the functions of the cell
• The host cell bursts open, releasing the new viruses
• The virus injects its genetic material into the cell
• A virus attaches to the surface of a host cell

Viruses cause infection by

• producing toxins that harm the body.

• reproducing independently inside the body.

• forming endospores.

• entering body cells and replicating.

If Andy is feeling symptoms from a virus that he contracted, the virus must be in the

• lytic cycle

• lysogenic cycle

• the capsid bursts

• the virus becomes dormant