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IGCSE Enzymes and Digestion Revision

Total questions: 30

Worksheet time: 19mins

Name
Class
Date
1.

Define the term ingestion

a)

The movement of nutrients from the digestive system into the blood

b)

The removal of undigested food from the body

c)

The breaking down of large insoluble molecules into small soluble molecules

d)

The taking in of nutrients.

2.

Define the term digestion

a)

The movement of nutrients from the digestive system into the blood

b)

The removal of undigested food from the body

c)

The breaking down of large insoluble molecules into small soluble molecules

d)

The taking in of nutrients.

3.

Define the term egestion

a)

The movement of nutrients from the digestive system into the blood

b)

The removal of undigested food from the body

c)

The breaking down of large insoluble molecules into small soluble molecules

d)

The taking in of nutrients.

4.

Define the term absorption

a)

The movement of nutrients from the digestive system into the blood

b)

The removal of undigested food from the body

c)

The breaking down of large insoluble molecules into small soluble molecules

d)

The taking in of nutrients.

5.

What gland produces amylase?

a)

Liver

b)

Gall bladder

c)

Salivary gland

d)

stomach

6.

Define the term mechanical digestion

a)

The breaking down of large food molecules by the use of enzymes.

b)

The physical break down of food done by the teeth or the muscles in the stomach.

7.

Define the term chemical digestion

a)

The breaking down of large food molecules by the use of enzymes.

b)

The physical break down of food done by the teeth or the muscles in the stomach.

8.

Which term describes the movement of food down the oesophagus by a wave of muscular contraction

a)

Diffusion

b)

Peristalsis

c)

Chyme

d)

Bolus

9.

What word is used to describe food which has been mixed with saliva.

a)

Chyme

b)

Bolus

c)

Churning

d)

Mucus

10.

What is the pH in the stomach?

a)

pH 1-2

b)

pH 3-4

c)

pH 11-12

d)

ph 13-14

11.

What is the acid produced in the stomach?

a)

Sulphuric acid

b)

Nitric acid

c)

Hydrochloric acid

d)

Acetic acid

12.

What part of the small intestine are nutrients absorbed into the blood?

a)

Ilium

b)

Duodenum

c)

Gall Bladder

d)

Liver

13.

What is absorbed into the blood from the large intestine?

a)

Digested nutrients

b)

Fibre

c)

Water

d)

Chyme

14.

What does the liver produce for the digestive system?

a)

Enzymes

b)

Bile

c)

Bolus

d)

Chyme

15.

Where is bile stored?

a)

Gall bladder

b)

Liver

c)

Pancreas

d)

Small intestine

16.

What is the role of bile in digestion?

a)

Emulsifies fat

b)

Kills bacteria

c)

Neutralises stomach acid

d)

Turns food into a bolus

17.

What is the job of the pancreas in digestion?

a)

Produces acid

b)

Produces bile

c)

Produces digestive enzymes

d)

Produces chyme

18.

Where are proteins mostly digested?

a)

Mouth

b)

Stomach

c)

Small intestine

d)

Large intestine

19.
What is the purpose  of an enzyme?
a)
give permission for the reaction
b)
raise activation energy
c)
speed up reactions
d)
control how many reactions occur
20.
What 3 letters do enzymes typically end in?
a)
-ose
b)
-ase
c)
-ese
d)
-tic
21.
Any substance that is acted upon by an enzyme is called a(n)?
a)
Coenzyme
b)
Substrate
c)
Vitamin
d)
Polypeptide
22.
Letter C...
a)
active site
b)
enzymes
c)
substrate
d)
products
23.
Enzymes provide a site where reactants called substrates can be brought together in an enzyme-catalyzed reaction. The site is called the
a)
enzyme substrate complex.
b)
reaction site.
c)
active site.
d)
lock and key.
24.
Based on the graph, what is the optimal temperature for this enzyme? 
a)
15oC
b)
40oC
c)
30oC
d)
35oC
25.
Which of the following conclusions can be drawn from this graph?
a)
The optimum pH of the enzyme is 6.6.
b)
The optimum pH of the enzyme is 5.8
c)
The enzyme’s activity increases as pH increases 5.0 to 9.0
d)
The enzyme’s activity is greater around pH of 8.0 .
26.
What happens when enzymes are heated to a high temperature?
a)
The enzymes die.
b)
The shapes of the enzyme are altered denature
c)
The enzymes' amino acid sequence changes.
d)
The enzymes remain the same
27.

Which nutrient contains the following elements: hydrogen, carbon, nitrogen and oxygen?

a)

carbohydrate

b)

protein

c)

lipid

d)

vitamin

28.

What mineral is needed for strong bones and teeth?

a)

iron

b)

potassium

c)

calcium

d)

magnesium

29.

Which mineral is needed to make haemoglobin?

a)

iron

b)

calcium

c)

magnesium

d)

nitrate

30.

What nutrient is needed for growth and repair?

a)

lipids

b)

vitamins

c)

carbohydrates

d)

proteins

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