Sylvia Mader Chapter 20-Viruses

Front

What is a host?

Back

A cell that the virus invades and takes over.

Front

Which of the following symbiotic relationships is considered parasitic?

Back

Ticks feeding on a dog.

Front

What do viruses need to reproduce?

Back

They need a host cell.

Front

Can a virus change the normal activity of a cell?

Back

Yes.

Front

Which of the following helps prevent the spread of infectious diseases?

Back

Vaccines.

Front

What is a virus?

Back

A microscopic infectious agent that can only replicate inside a host cell.

Front

What is the structure of a virus?

Back

Viruses consist of genetic material (DNA or RNA) surrounded by a protein coat.

Front

How do viruses spread?

Back

Viruses can spread through direct contact, airborne transmission, or contaminated surfaces.

Front

What is the difference between a virus and bacteria?

Back

Viruses require a host to reproduce, while bacteria can reproduce on their own.

Front

What is a vaccine?

Back

A substance that stimulates the immune system to recognize and fight specific viruses.