Chapter 7: Bacteria and Viruses

Bacteria are found ______.

• on the North American continent

• in Asia

• in Europe

• on all the continents

What does the flagellum of a bacteria do?

• contain DNA

• protect the bacterium from drying out

• help bacteria stick to surfaces

• allow the bacteria to move

What is the purpose of the capsule on bacteria?

• allow the bacteria to move

• protects the bacterium from drying out

• help bacteria stick to surfaces

• contain DNA

What is the purpose of the pili on the surface of bacteria?

• enocurages reproduction

• protects the bacterium from other bacteria

• help bacteria stick to surfaces

• allow the bacteria to move

Which of the following is NOT a method used by bacteria to obtain food?

• feed on dead organisms

• use light energy and make food

• use energy from chemical reactions to make food

• grow and harvest food

Bacteria that live in places with a supply of oxygen are _____.

• anaerobic

• aerobes

• viruses

• capsules

Of the following, where are archaea likely to be found?

• hot springs

• dental plaque

• freshwater ponds

• cattle intestines

Bacteria are unlike plant and animal cells because they _____.

• are smaller

• make their own food

• have many organelles

• have a nucleus

Thick walls produced by some bacterial pathogens are called _____.

• endospores

• saprophytes

• antibiotics

• nitrogen-fixing

What do bacteria do in a cow's stomach?

• cause infection

• break down cellulose

• produce vitamin K

• construct cellulose