L4: 4.1 “Digestion in the Mouth”. PURPOSE: To explain digestion as it occurs in the mouth.

L4: 4.1“Digestion in the Mouth”

PURPOSE:To explain digestion as it occurs in the mouth.

HYPOTHESIS:I believe…because…

PROCEDURE (4 slides):1

30 drops starch

330 drops DW

2 drops amylase

530 drops starch

2 drops amylase

230 drops starch

430 drops DW

2 drops amylase

630 drops starch

2 drops amylase

PROCEDURE:Stir with toothpick.Allow cups to sit for at least 5 minutes.

While you wait, answer the following questions.

1. What do you think amylase is?2. What do you think amylase will

do when you mix it with the starch solution?

3. Why do you need to wait 5 minutes before you perform the tests on the starch solution and amylase mixture?

PROCEDURE:Perform a sugar test for the substances on the top row.

Perform a starch test for the substances on the bottom row.

Record results on data chart.

DATA (3 slides):Test type: Starch: DW &

amylase:Starch & amylase:

Sugar Test Results

Starch Test Results

DATA QUESTIONS:1. For which nutrient, sugar or

starch, did the starch solution test positive?

2. For which nutrient, sugar or starch, did the amylase (with DW) test positive?

3. For which nutrient, sugar or starch, did the mixture of amylase & starch solution test positive?

DATA QUESTIONS:4. Amylase is found in

human saliva. It is a certain type of chemical called an enzyme. On the basis of what amylase did in this inquiry, how would you define an enzyme?

VOCABULARY:Mechanical digestionChemical digestionAmylaseEnzymeStarchSugarcatalyzes

CONCLUSION:Be sure to use complete

sentences.Be sure to look back at your

original purpose and discuss it in your conclusion.

Be sure to use each vocabulary word in your conclusion.

L4: 4.1 “Digestion in the Mouth”. PURPOSE: To explain digestion as it occurs in the mouth.

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