Normal Flora

1. What is the human microbiome?

• A all of the communities of microbes in and on the human body
• B a drug that destroys helpful bacteria along with harmful bacteria
• C a species of bacteria that helps protect humans against asthma
• D a group of people in developed countries who are infected with Heliobacter pylori

2. What information in the text supports the following statement?
Some species of bacteria benefit humans.

• A S. mutans is a bacterium that causes cavities, and S. pneumonia is a bacterium that causes pneumonia.
• B Fungi evolved the ability to produce anti-bacterial chemicals as they competed with bacteria over millions of years.
• C The bacterium Streptococcus pyogenes causes strep throat and rheumatic heart disease.
• D Species of bacteria belonging to the genus Bacteroides help the human body digest food.

Medicines that kill microorganisms, especially bacteria

• antibiotics

• bacteria

• cells

• claim

After using antibiotics there are _________ healthy bacteria in the gut.

• More

• The same

• Less

Are microorganisms helpful or harmful?

• Helpful

• Both

• Harmful

• Neither

True of False: Antibiotics kill only harmful bacteria.

• False

• True

What happens to our bodies when we take too many antibiotics medicines in a short period of time?

• We eventually get sicker

• They no longer are effective.

• They can kill our healthy bacteria

• All of the above

Most helpful bacteria live:

• in the gut

• in the mouth

• on the skin

• in the stomach

The human microbiome contains approximately 100 trillion ___________. Most of these are bacteria.

• microorganisms

• blood cells

• fungi

• C. jejuni

Living things with ________ than normal helpful bacteria in their guts can become infected more easily because there is more food and space available for harmful bacteria.

• fewer

• more