Digestion

Question 1

Name, the four processes involved in digestion

Answer 1

Ingestion
Digestion
Absorption
Egestion

Question 2

What is digestion

Answer 2

The breakdown of large insoluble molecules. It’s a small soluble molecules, so they can be absorbed for use by the body cells.

Question 3

What is a molecule of protein made up of?

Answer 3

Amino acids
( protease)

Question 4

What is a molecular fat made up of?

Answer 4

Fatty acids and glycerol
( lipase)

Question 5

What is a molecule of carbohydrate made up of?

Answer 5

A molecule of a carbohydrate such as starch is made up of smaller molecules called glucose

Carbohydrase used
(E.g amylase)

Question 6

Denaturation

Answer 6

Enzymes react best at their optimum temperature. This is where the rate of reaction is highest when an enzyme becomes denatured. The shape of the active site will change. Therefore the substrate will not be able to bind to the active site and no product will be released. it can never return back to its original shape.

Question 7

How do we test for starch?

Answer 7

In the presence of starch iodine solution will change colour from brown to blue/black. If there is no starch found the solution will stay brown.

Question 8

Test for sugar (glucose)

Answer 8

If glucose is present, Benedict reagent will change the colour from blue to green to yellow and eventually brick red.
( in contrast to other food test, it must be heated above 95°)

Question 9

How do we test for protein?

Answer 9

Biuret will cause the solution to go from blue to lilac if protein is present