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.
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