AQA GCSE Biology Unit 2.3

Question 1 of 20

1

Which of these are functions of proteins in the human body?

Select one or more of the following:

Antibodies
Catalysts
Energy stores
Hormones
Toxins
Structural components

Explanation

Question 2 of 20

1

True or false? Enzymes have a specific shape called the active site so each enzyme can only catalyse one type of reaction.

Select one of the following:

True
False

Explanation

Question 3 of 20

1

Which of these provides the best description of the lock-and-key model of enzyme action?

Select one of the following:

When an enzyme finds a substrate, it releases tiny molecules which act as "keys" to the particular "lock" of the substrate, helping to catalyse the reaction.
When a substrate (the lock) comes into contact with the enzyme (the key) with the correct active site, the two chemicals form an enzyme-substrate complex which allows the reaction to be catalysed.
Enzymes block passageways in the body which can be only opened if the substrate comes and the reaction is catalysed.

Explanation

Question 4 of 20

1

Which of these are examples of reactions involving enzymes?

Select one or more of the following:

Breaking down large molecules into small molecules
Building large molecules from small molecules
Changing one molecule into another
Making molecules disappear
Causing molecules to diffuse across a partially permeable membrane

Explanation

Question 5 of 20

1

True or false? The optimum pH of action for any enzyme is always pH7.

Select one of the following:

True
False

Explanation

Question 6 of 20

1

True or false? If the core body temperature rises too much above 37°C (hyperthermia) then enzymes change shape and denature - they cannot catalyse any reactions.

Select one of the following:

True
False

Explanation

Question 7 of 20

1

Which of these enzymes are used in the digestion of starch?

Select one of the following:

Amylase and maltase
Protease
Lipase

Explanation

Question 8 of 20

1

What are the products of digestion of proteins?

Select one of the following:

Glucose
Amino acids
Fatty acids and glycerol

Explanation

Question 9 of 20

1

What are the products of digestion of lipids?

Select one of the following:

Glucose
Amino acids
Fatty acids and glycerol

Explanation

Question 10 of 20

1

Which of these tests would you use to detect the presence of reducing sugars such as glucose?

Select one of the following:

Tollens' reagent
Benedict's reagent
Biuret reagent
Iodine test

Explanation

Question 11 of 20

1

Which of these are functions of bile?

Select one or more of the following:

Makes absorption of small soluble particles easier
Neutralises hydrochloric acid in the stomach and makes the conditions alkaline
Emulsifies drops of fat into smaller droplets, increasing surface area for enzyme action
Carries protease enzymes for digestion of protein

Explanation

Question 12 of 20

1

True or false? Pepsin is produced in the stomach because its optimum pH is around pH2.

Select one of the following:

True
False

Explanation

Question 13 of 20

1

True or false? Bile is an enzyme.

Select one of the following:

True
False

Explanation

Question 14 of 20

1

Which of these are advantages of using biological washing powders?

Select one or more of the following:

They run at lower temperatures so use less energy to heat the water
They can cause allergic reactions in some people
They can digest protein-based fabrics such as wool
They contain proteases which are effective in removing stains such as blood and sweat

Explanation

Question 15 of 20

1

Why do we use protease enzymes in baby foods?

Select one of the following:

To make the baby food taste more pleasant
To pre-digest proteins as babies have low levels of proteases
To remove biological stains such as sweat and blood

Explanation

Question 16 of 20

1

Which enzyme is used in slimming foods to convert glucose into fructose?

Select one of the following:

Amylase
Fructase
Zymase
Isomerase

Explanation

Question 17 of 20

1

Which of the following sugars is used in slimming foods as it has a sweeter flavour for the same level of sweetness and so is required in smaller amounts?

Select one of the following:

Glucose
Mannose
Sucrose
Fructose
Lactose

Explanation

Question 18 of 20

1

	Created by Matthew T over 10 years ago

Twenty questions for the third section of Unit 2 in AQA GCSE Biology: Enzymes.

AQA GCSE Biology Unit 2.3

AQA GCSE Biology Unit 2.3

Question 1 of 20

Which of these are functions of proteins in the human body?

Select one or more of the following:

Explanation

Question 2 of 20

True or false? Enzymes have a specific shape called the active site so each enzyme can only catalyse one type of reaction.

Select one of the following:

Explanation

Question 3 of 20

Which of these provides the best description of the lock-and-key model of enzyme action?

Select one of the following:

Explanation

Question 4 of 20

Which of these are examples of reactions involving enzymes?

Select one or more of the following:

Explanation

Question 5 of 20

True or false? The optimum pH of action for any enzyme is always pH7.

Select one of the following:

Explanation

Question 6 of 20

True or false? If the core body temperature rises too much above 37°C (hyperthermia) then enzymes change shape and denature - they cannot catalyse any reactions.

Select one of the following:

Explanation

Question 7 of 20

Which of these enzymes are used in the digestion of starch?

Select one of the following:

Explanation

Question 8 of 20

What are the products of digestion of proteins?

Select one of the following:

Explanation

Question 9 of 20

What are the products of digestion of lipids?

Select one of the following:

Explanation

Question 10 of 20

Which of these tests would you use to detect the presence of reducing sugars such as glucose?

Select one of the following:

Explanation

Question 11 of 20

Which of these are functions of bile?

Select one or more of the following:

Explanation

Question 12 of 20

True or false? Pepsin is produced in the stomach because its optimum pH is around pH2.

Select one of the following:

Explanation

Question 13 of 20

True or false? Bile is an enzyme.

Select one of the following:

Explanation

Question 14 of 20

Which of these are advantages of using biological washing powders?

Select one or more of the following:

Explanation

Question 15 of 20

Why do we use protease enzymes in baby foods?

Select one of the following:

Explanation

Question 16 of 20

Which enzyme is used in slimming foods to convert glucose into fructose?

Select one of the following:

Explanation

Question 17 of 20

Which of the following sugars is used in slimming foods as it has a sweeter flavour for the same level of sweetness and so is required in smaller amounts?

Select one of the following:

Explanation

Question 18 of 20

True or false? There are concerns about using enzymes in industry because they may enter waterways with unknown effect on aquatic life.

Select one of the following:

Explanation

Question 19 of 20

Which of these are advantages of using enzymes in industry?

Select one or more of the following:

Explanation

Question 20 of 20