Intro

Cracker intro:

•What happened to the cracker and why?

• Did the cracker taste the same as time went on?

Enzyme

starch

Enzyme

Sugar

Enzyme function

How do enzymes work? • Digestive enzymes break macromolecules into their building blocks

• An enzyme is specific for its substrate

• An enzyme is reusable

water sugar starch

iodine

water amylase

Starch-iodine solution

amylase

What would happen if you added more iodine?

iodine

amylase

What would happen if you added more starch?

starch

Enzyme

Enzymes are proteins = amino acids chains folded up in a specific way

• Proteins are sensitive to their environment• Heat or acidity can change the shape of proteins

How acids effect enzymes

Acid (vinegar)

amylase

Starch-iodine solution Starch-iodine solution

Acid (vinegar)

Amylase lesson

water

Starch-iodine solution Starch-iodine solution

amylase

Amylase lesson

Lab activity: Testing the amylase activity in your saliva

Amylase lesson

Why were some samples lighter blue than others?

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Interpreting your results

What does the amount amylase in your saliva tell you?

• Can you change the amount of amylase in your saliva through your diet?

• Do students with a high amount of amylase in the class have an evolutionary advantage over other students with a lower amount?