Microorganism

Why is a microscope needed to view cells?

• to separate cells from each other 
• to make cells look bigger than they are
• to make cells look smaller than they are
• to hold the cells still so they can be seen

Identify a statement that shows how bacteria are NOT helpful to humans.

• Bacteria break down dead plants and animals
• Bacteria break down water, soil, and air pollution.
• Bacteria cause inflammation of tissues and often a fever. 
• Bacteria break down the milk protein to create cheese. 

Beneficial or Harmful?

bacteria used in cheese and yogurt

• beneficial

• harmful

Beneficial or Harmful?

yeast used to cause bread to rise

• beneficial

• harmful

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Beneficial or Harmful?

fungus causes ringworm or athlete's foot on the skin

• beneficial

• harmful

Beneficial or Harmful?

bacteria weakens teeth enamel

• beneficial

• harmful

Beneficial or Harmful?

mold used to create Penicillin (antibiotic)

• beneficial

• harmful

Nitrogen-fixing bacteria are important because...

• they are decomposers
• they are salt lovers
• they provide protection for plants from diseases
• they make nitrogen available to plants in form they can use

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Bacteria are made up of how many cells?

• 1
• 2
• 3
• trillions!

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Mold helps dead things (plants, animals)...

• Grow
• Decay
• Sleep
• Reproduce

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