Virus

A virus consists of:

• RNA or DNA and a cell membrane

• RNA or DNA and a protein coat

• RNA and DNA and a protein coat

• proteins, cell membrane, and RNA

What happens after the virus has been taken up by the cell?

• it begins making protein

• it divides, or replicates

• it inserts into the host DNA

• it switches to infectious mode

What reason do scientists give for saying that viruses are not living organisms?

• they cannot reproduce without the aid of a host

• they do not metabolize food into energy

• they do not have organized cells

• all of the above

• none of the above

True or False: Most viruses are so small that they can't be seen with with the unaided eye (basically saying we can't see them unless we have a microscope)

• True

• False

Why do viruses need a host cell?

• because they aren't living

• because they need to reproduce

• because they can't live without a host cell

How does a virus cause a person to develop the common cold?

• invades the host cell to reproduce
• removes energy from the host cell
• produces toxins in the host cell
• protects the host cell from bacteria

How does a virus cause disease?

• It disrupts homeostasis and equilibrium in the body.

• It produces toxic substances that harm the body.

• It rapidly undergoes mitotic cell division that quickly

  smothers nearby cells.

• It forms endospores in the body.

Which of the following correctly describes viruses?

• non-living because they grow and develop
• living because they can use energy
• non-living because they cannot reproduce on their own
• living because they can maintain homeostasis

Which of the following is a trait that a virus shares with a living organism?

• They use oxygen
• They have genetic material
• They grow
• They digest food

What does a virus have on the outside?

• a protein coat
• a fur coat
• crispy skin
• membrane