Cells and Microorganisms

_____ are the smallest unit of life and make up all living things.

Cell structures perform basic life functions

for the cell.

• true

• false

Which types of magnifiers can be used to observe cells and their structures?

• eye

• telescope

• microscope

• glasses

A _____ is much smaller than bacteria and cannot reproduce or grow unless it infects another organism. It uses the organism’s cells to reproduce by making copies of itself, eventually making the host organism sick.

single-celled microorganisms that can live in almost every environment and grow and

reproduce on their own.

• virus

• cell

• microorganism

• bacteria

Which bacteria types are beneficial?

• the ones that cause illness

• the ones that spoil food

• the ones that make cheese

• the ones that break down chemicals and waste

Which picture shows an example of microorganisms (living things that are too small to be seen without magnification)?

• 
• 
• 

Which structures are found in BOTH animal and plant cells?

• cell membrane

• cell membrane

• cytoplasm

• nucleus

Which sentence describes how the differences between a plant cell and an animal cell can be determined by looking at the parts inside the cell?

• Plant cells have a nucleus, but animal cells do not.

• Plant cells have chloroplasts, but animal cells do not.

• Plant cells do not have a nucleus, but animal cells do.

• Plant cells do not have chloroplasts, but animal cells do.

A student observed a label found on raw chicken meat sold at the grocery store.

WARNING: COOK THOROUGHLY TO KILL BACTERIA.

Which argument should the student use to support a claim that some bacteria are harmful to

humans?

• Some bacteria can harm humans because bacteria reproduce faster when they are cooked at high

  temperatures.

• Some bacteria can harm humans because bacteria become toxic when cooked at high temperatures.

• Some bacteria can harm humans because bacteria make food taste bad when it is not cooked

  properly.

• Some bacteria can harm humans because bacteria can cause food poisoning when contaminated food

  is not cooked properly.