Enzymes

Question 1

What is a catalyst?

Answer 1

A catalyst is a substance which increases the speed of reaction without being changed or used up in a reaction.

Question 2

Give three functions of proteins in living cells other than acting as catalysts.

Answer 2

• Structural components of tissues
• hormones
• antibodies

Question 3

In which three places in the body is amylase produced

Answer 3

1) Salivary glands
2) The pancreas
3) The small intestine

Question 4

Where in the body is bile produce, stored and used?

Answer 4

Produced in the liver
Stores in the gall bladder
Used to neutralise the acid and make everything and alkaline as bile is an alkaline.

Question 5

Why does the stomach produce hydrochloric acid?

Answer 5

1) To kill bacteria

2) To give the right pH for the protease enzyme to work.

Question 6

Write down the word equation for aerobic respiration.

Answer 6

Glucose+oxygen-> Carbon dioxide+water+energy

Question 7

What does Amylase do and where is it made?

Answer 7

It converts starch into sugar and is made in the:

1) salivary glands
2) Pancreas
3) small intestine

Question 8

What does protease do and where is it made?

Answer 8

It converts proteins into amino acids. It is made in the:

1) stomach (called Pepsin in there)
2) pancreas
3) small intestine

Question 9

What does lipase do and where is it made?

Answer 9

Converts lipids into glycerol and fatty acids.
It is made in the:
1) Pancreas
2) small intestine

Question 10

What are digestive enzymes used for? Give examples for big/small molecules.

Answer 10

To break down big molecules into smaller ones.
Eg Big molecules (starch, protein, fats)
Small molecules (sugars, amino acids, glycerol, fatty acids)