Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account

Biology Ch. 18: Viruses and Prokaryotes


An infectious particle made only of a strand of DNA (or RNA) surrounded by a protein coat.


Anything that can cause a disease, such as bacteria, fungi, or a virus.


Infectious particles that cause disease in plants. They are made of single-strand DNA without a protein coat.


The part of a virus that holds DNA

lytic infection

A type of viral infection in which the host cell bursts, releasing new viral offspring to infect other cells.


To cause disease

lysogenic infection

A type of infection where a virus combines its DNA into the host cell's DNA

host cell

A cell that a virus has attacked and is using to reproduce.


A rapid outbreak of an infection. The flu is an example of an __________. In the U.S., 20 million people are infected with the flu every year.


To happen quickly


A substance, often given as a shot, that causes the body to defend against viral diseases. For example, you got the DTAP ________.


A long, whip-like structure outside of a cell that is used for movement, kind of like a tail that helps a bacteria swim.


A poison released by an organism. Bacteria can cause illness because it releases this into the bloodstream.


chemicals that kill or slow the growth of bacteria.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording