UNIT 5: You are what you eat!

Ms.Liu

Biology

1/13/12

1. Break a saltine in half and share it with someone at your table!

2. Put it in your mouth…NO CHEWING!

3. Just let it sit on your tongue.

WHAT HAPPENS???

Bellringer

1. What happened to the cracker in your mouth?

2. Which of the following nutrients can you guess is in the cracker?

a. Protein c. Carbohydrate

b. Starch d. Fat

***BONUS: What test can you use to find the nutrient?

Starch

• A complex carbohydrate and a macromolecule

Enzyme

• A protein that changes the rate of chemical reactions (usually speeds them up)

• Amylase = an enzyme

in your saliva

Maltose

• A simple sugar that results when starch is broken down by amylase

Testing Materials• Benedicts solution = indicator that turns

orange/red when there is glucose

• Lugol’s Iodine = indicator that turns blue/black when there is starch

• Glucose test strips = changes color when there is maltose

• Buffers = Can be added to solution to control pH

Lab Set Up

• Do steps 1-6 in your textbook, p. 273-274