Viruses

A (a)   is a tiny, nonliving particle that invades and then multiplies inside a living cell.

The only way in which viruses are like organisms is that can multiply.

• True

• False

What is a host?

(a)   , organisms that live on or in a hostand can cause harm.

Almost all viruses destroy their host cells.

• True

• False

All viruses have two basic parts, what are they?

The shape of the _________ ________ allows viruses to attach to certain cells in a host.

(a)  

Explain the lock-and-key action of a virus.

A virus that immediately goes into action or shows signs of symptoms is known as

• hidden

• active

• dormant

• visible

A (a)   virus may stay inactive for years before it presents itself.