Viruses

Viruses are the cause of some diseases

• True

• False

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

What is the only way in which viruses are like organisms?

Viruses can only multiply when they are inside a living cell.

• True

• False

A (a)   is a living thing that provides a source of energy for a virus or an organism.

Almost all viruses destroy their host cells

• True

• False

(a)   are organisms that live on or in a host and can cause harm.

Viruses vary in

• size

• shape

A (a)   is a virus that infects bacteria.

All viruses have two basic parts

• protein coat

• inner core

• outer membrane

• envelope