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Unit 19: Biology Part 2 Page 117 of 137

Experiment: The Skin You’re In

Your skin is your first line of defense against pathogens. Everyday, many
germs come your way, but most of them are blocked by your skin. This
simple model can show how.

Materials:

 Apple

 Plastic wrap
 Food coloring

1. Cut an apple in half.

2. Cover one half in plastic wrap; leave the other uncovered.
3. Add several drops of food coloring to each apple, and make
observations.

What’s Happening: The plastic wrap represents the skin, and the food
coloring represents a pathogen. Without skin, pathogens could easily enter
the body. The thick skin keeps most pathogens out.

Experiment: Take All Your Medicine!

If you have ever been prescribed an antibiotic, your doctor probably
reminded you to take all the medication prescribed, even if you started to
feel better. Why is this so important?

Materials:

 30 pennies
 12 nickels

 6 dimes
 4 quarters
 Deck of cards

1. For this experiment, assume the following:
a. Coins represent bacteria. The higher the monetary value of the
coin, the more resistant it is. (The harder it is to kill.)
b. If you have more than 35 bacteria, you will feel sick.

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