Unit 8 Quiz-Viruses

The outer protein coat of a virus is called a

• DNA core.

• capsid

• bacteriophage.

• tail sheath.

All viruses are made of proteins and

• nucleic acids.

• prophages.

• endospores.

• bacteriophages.

The instructions for making new copies of a virus are

• a part of a virus’s capsid.

• coded in surface proteins attached to the protein coat.

• coded in either RNA or DNA.

• found only in bacteriophages.

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 fibers

• a tiny cell surrounded by a cell wall

Viruses

• are all about the same size.

• vary greatly in size and structure.

• rarely contain DNA or RNA.

• can be seen with a basic compound light microscope.

A lytic infection concludes with the

• embedding of viral DNA into the host cell’s DNA.

• production of a prophage.

• bursting of the host cell.

• production of messenger RNA.

A prophage is made of

• bacteriophages.

• carbohydrates.

• capsid proteins.

• viral DNA.

Bacteriophages infect

• other viruses.

• bacteria only.

• any available host cell.

• cells undergoing the lytic cycle.

Unlike lytic viruses, lysogenic viruses do NOT

• inject their genetic material into the host cell.

• enter the lytic cycle.

• lyse (burst) the host cell right away.

• infect host cells.

During a lytic infection, the host cell is

• destroyed.

• prepared for the lysogenic cycle.

• copied many times over.

• all of the above