Download - L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?
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L4:“Digestion in the
Mouth”
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Question:How does the digestion of starch occur in the mouth?
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HYPOTHESIS:If starch is digested in the mouth
Then we will seeBecause
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PROCEDURE1
30 drops starch
3
30 drops DW
+
2 drops amylase
5
30 drops starch
+
2 drops amylase
2
30 drops starch
4
30 drops DW
+
2 drops amylase
6
30 drops starch
+
2 drops amylase
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PROCEDURE:Stir with toothpick.Allow cups to sit for at least 5 minutes.
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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?
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PROCEDURE:Perform a sugar test on the top row (10
drops of Benedicts in 1, 3, 5) – put in 3 different test tubes and place in water bath
Perform a starch test on the bottom row (3 drops of Lugols in 2, 4, 6)
Record results on data chart.
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Data:Test type: Starch: DW &
amylase:Starch & amylase:
Sugar Test Results
1 3 5
Starch Test Results
2 4 6
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Benedicts and Lugols
Benedicts (1,3,5)
+ = light green orange
- = blue
Lugols (2,4,6)
+ = dark blue/purple or black
- = yellowish brown
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DATA QUESTIONS:1. For which nutrient, sugar (well 1) or starch
(well 2), did the starch solution test positive?2. For which nutrient, sugar (well 3) or starch
(well 4), did the amylase (with DW) test positive?
3. For which nutrient, sugar (well 5) or starch (well 6), did the mixture of amylase & starch solution test positive?
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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?
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VOCABULARY:Mechanical digestionChemical digestionAmylaseEnzyme
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Vocabulary defined:
Mechanical digestion – break down food using your teeth
Chemical digestion – break down food using chemicals (ex. Amylase)
Amylase – enzyme; helps break down starch
Enzyme – protein; speeds up chemical reactions
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CONCLUSION:Be sure to use complete sentences.Make the original question a statement.Was your hypothesis supported or
rejected and why?Be sure to use each vocabulary word in
your conclusion and UNDERLINE.