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Unit 19: Biology Part 2 Page 93 of 137

Glass A is much lighter than glass B. Why? This is because the enzyme
Amylase in saliva digests starch. The iodine reacted with the starch in glass
B, but there was no starch in glass A with which the iodine could react.

Experiment: All in Good Taste?

Find out your sensitivity to sweet and salty tastes. This is best done with a
partner.

Materials:

 Measuring cup
 Plastic cups

 Water
 Sugar
 Salt
 Paper towels
 Paper and pen
 Permanent marker
 Notebook

What to do:

1. Create sugar and salt solutions.
a. Mix 1: Mix 1 2/3 cups of water with ¼ sugar. Label the solution
“12.5% Sugar”.
b. Mix 2: Make mix 1 take ½ cup of it and then add 1 ½ cup
water. Label this solution “3.1% sugar”.
c. Mix 3: Take ½ cup of mix 2 and add it to 1 ½ cups of water.
Label this solution “0.78% Sugar”.
d. Mix 4: Mix ½ cup of Mix 3 with 1 ½ cups of water. Label this
solution “0.19% Sugar”.

e. Make the same solutions with salt.
2. Have your partner pour a little of one of the solutions onto a paper
towel and put it on your tongue. Tell her or him with you can taste the
solution, and whether it is salty or sweet. Between each taste rinse out
your mouth.
3. Do the same for your partner.
4. If you can, test three more people.

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