l4: “digestion in the mouth”. question: how does the digestion of starch occur in the mouth?

L4: “Digestion in the Mouth”

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L4:“Digestion in the

Mouth”

Question:How does the digestion of starch occur in the mouth?

HYPOTHESIS:If starch is digested in the mouth

Then we will seeBecause

Page 4: L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?

PROCEDURE1

30 drops starch

30 drops DW

2 drops amylase

30 drops starch

2 drops amylase

30 drops starch

30 drops DW

2 drops amylase

30 drops starch

2 drops amylase

Page 5: L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?

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

Page 6: L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?

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?

Page 7: L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?

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.

Page 8: L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?

Data:Test type: Starch: DW &

amylase:Starch & amylase:

Sugar Test Results

1 3 5

Starch Test Results

2 4 6

Page 9: L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?

Benedicts and Lugols

Benedicts (1,3,5)

+ = light green orange

- = blue

Lugols (2,4,6)

+ = dark blue/purple or black

- = yellowish brown

Page 10: L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?

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?

Page 11: L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?

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?

Page 12: L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?

VOCABULARY:Mechanical digestionChemical digestionAmylaseEnzyme

Page 13: L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?

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

Page 14: L4: “Digestion in the Mouth”. Question: How does the digestion of starch occur in the mouth?

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.

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