U3.L5 Carbohydrates in the digestive system

Multiple Choice

Ella wanted to test for the presence of starch in bread. What indicator should she use?

• iodine

• Benedicts

• Biuret

• Ethanol

Multiple Choice

Iodine was dropped on the apple shown in the picture. The results show that the apple contains starch.

• TRUE

• FALSE

Multiple Choice

Iodine was dropped on a potato. Based on the image, the potato contains starch.

• TRUE

• FALSE

Multiple Select

Five food samples were tested with Benedict's solution. Based on the picture, which ones contain sugars?

• A

• B

• C

• D

• E

Labelling

At the end of our dialysis experiment, what food molecules did we find inside and outside of the dialysis tube?

Drag labels to their correct position on the image

starch

no food molecules

sugar

sugar and starch

Labelling

Label the parts of the model.

Drag labels to their correct position on the image

sugar molecule

starch molecule

water

starch and sugar solution

Dropdown

Based on our experiment, ​

Select answer

moves through the dialysis tube into the water outside, ​

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doesn’t. This is what happens in your ​

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too!

Open Ended

How does the structure of a complex carbohydrate molecule (starch) compare to a sugar molecule (glucose)? How does this relate to our experiment?

Open Ended

We’ve now seen that glucose goes through the walls of the small intestine, but starch does not. But starch also disappears from a healthy small intestine, so what happens to it??? 

Multiple Choice

Which carbohydrates begin to decrease first in a healthy digestive system?

• sugar (glucose)

• starch (complex carbohydrates)

• Fiber

Dropdown

As the graham cracker is chewed in the mouth, the amount of ​

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increases at the same time that the amount of ​

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decreases.

Multiple Choice

Look at the structures of the glucose and starch molecules. What could be happening to starch in the mouth that would explain why the amount of starch decreases while the amount of glucose increases?

• The glucose molecules are combining to form starch.

• The starch molecule is being broken apart into sugar molecules.

• The starch is being absorbed into your teeth.

• The starch turns into protein.

Dropdown

As food moves through the small intestine, the amount of fiber ​

Select answer

.

Open Ended

Fiber stays the same throughout the digestive system. 

How could its structure explain this?

Multiple Choice

Based on the graphs, what food molecules should be found in a healthy person's poo?

• sugar

• starch

• fiber

• protein

Multiple Select

Based on the graphs, what food molecules should be found in a M'Kenna's poo?

• sugar

• starch

• fiber

• protein