Microorganisms

Most bacteria are one of three basic shapes: ball, rod, or

The smallest bacteria are about the size of the largest viruses.

• True

• False

The bacteria then grow and multiply quite quickly. Because these bacteria give off toxins

• True

• False

Bacteria are single-celled organisms, also known as ...................................., that lack a nucleus.

• eukaryotes

• prokaryotes

Bacteria have ............................... that protect them from attacks and keep them from drying out

• cell membrane

• Flagella

• cell walls

The ........................................ controls what substances pass into and out of the cell.

Protists are classified in Domain Eukarya and are simpler than the plants, animals, and fungi

• True

• False

Archaea and Bacteria are ........................... complex than protists.

• more

• less

Archaea and bacteria are .............................. microorganisms that do not have a nucleus.

• unicellular

• multicellular

Many archaea live in extreme conditions and make food from chemicals. You might find archaea in hot springs, very salty water, or deep underground..

• true

• false