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1

AQA Biology GCSE Unit 4
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Enzyme

Site of Production

Substrate

amylase

Bile is made in the liver and stored in the gall bladder
...


i







protein



pancreas

The diagram below shows the ‘lock & key’ model of
enzyme function
...


f

The movement of water molecules from a high water concentration to a lower water concentration across a
partially permeable membrane
...

The movement of glucose molecules around the plant
...


k

1
...

0

Temperature (oC)

40

3
...



Describe how to carry out the test for reducing sugars
...




g
Enzymes are described as being ‘specific’ to a substrate
...





Describe how this root hair cell is adapted for the
efficient uptake of water and mineral ions
...




m
Describe how to test for starch
...




Describe how to test for protein


3
...
What is the function of xylem
tissue?

2
...
2 Organisation
a

Complete the table below
...
Label the diagram using the following
words:

Bile neutralises stomach acid to raise the pH so protease enzymes can work
...


b

Use the graph below to describe how temperature
affects enzyme function
...

The evaporation and diffusion of water from the leaves of a plant
...


k

Any 3 from;

Temperature ( C)
o

Where in the plant is meristem tissue located?
List 5 important keywords from this unit
...
Place the test sample into a test tube (about 2ml)
...
After 40˚C, as the temperature increases the

1
...
Add an equal amount of Benedicts reagent
...


2
...
Heat in a water bath for 5 minutes
...
The colour will change from blue to either green/
yellow/red depending on the amount of reducing sugar
present
...

What does this mean? Use a labelled diagram to help your
explanation
...
The active
site of the enzyme has a unique shape, only a substrate
with a complimentary shape can fit and bind to form an

l

They have a large surface area for the rapid absorption of
water and mineral ions from the soil
...


q

3
...


To transport water and dissolved minerals from the roots
to the stem and the leaves
...


Why are enzymes referred to as ‘biological catalysts?

stream
...


r
Describe how to test for starch
...

Add a few drops of iodine solution and mix
...


h
n

1
...
Add an equal amount of Biuret reagent and mix
...
The colour will change from blue to purple if protein

plant
...




is present
...
What is the function of xylem
tissue?

enzyme-substrate complex
...


Initially, as temperature increases, the rate of enzyme
c

From which part of the human digestive system is
nutrients absorbed into the bloodstream?

Temperature, Light intensity, Air flow or Humidity
...


X

The movement of glucose molecules around the plant
...


j

Transpiration is:

0

enzyme

i

Bile is made in the liver and stored in the gall bladder
...


nucleus, cell, tissue, organ, organism

active site

enzyme-substrate
complex

e

cell, organ, nucleus, tissue, organism

products

substrate

Place the following structures in order from smallest
to largest:

My main areas for improvement in this unit are:



s

3

AQA Biology GCSE Unit 4
...


a

Describe how the structure of an
artery is related to its function
...


b

i

1
...




2
...


3
...


In coronary heart disease, layers of fatty material
build up inside the coronary arteries
...


e

What is a ‘carcinogen’? Give an example
...
What is ‘rejection’?


Name the group of cells that controls the resting heart
rate
...


k

1
...






4
...















Unborn babies





Describe 3 lifestyle factors that can impact a person’s
physical and mental wellbeing
...

2
...


g

q



5
...




o





Stents can be used to treat coronary heart disease
...


n

4
...





Label the following parts on the diagram below:
trachea, bronchi, bronchiole, alveolus
...



m

My main areas for improvement in this unit are:




s

4

AQA Biology GCSE Unit 4
...


d

Why does the left ventricle have a thicker, more muscular wall than the right ventricle?

h

The left ventricle has to pump blood at high pressure so that it can reach all body cells
...


pulmonary atery

Name the four main components of the blood and
describe their function
...
Red blood cells – transport oxygen
...


2
...


i

Describe 3 ways that the lungs are adapted for
gaseous exchange
...


3
...


vena cava

pulmonary vein

Label the following parts on the diagram below:

b

In coronary heart disease, layers of fatty material
build up inside the coronary arteries
...


e

What is a ‘carcinogen’? Give an example
...
Plasma – liquid part of the blood, carries many
substances e
...
glucose, hormones
...
This results in a

j

Substance/chemical that causes cancer e
...
the chemicals
in cigarette smoke
...


lack of oxygen and the heart muscle cells stop respiring

bronchi

which can lead to a heart attack
...
Give
one advantage and one disadvantage of using stents
...
What is ‘rejection’?

f

Advantage

alveolus

Describe how smoking tobacco affects:

Name the group of cells that controls the resting heart
rate
...


Adults

Disadvantage

Can cause lung disease, including cancer, and cardiovascular

There is a risk of the patient developing a blood clot near

disease
...


Unborn babies
Can result in low birth weight and premature birth
...


g

Any 3 from: Diet, exercise, stress, smoking, drinking alcohol
...


k

p

Pacemaker

1
...


What are ‘statins’?

3
...


4
...


Explain how an infection with a microorganism could
lead to the development of other, non-communicable
diseases
...
g
...
Also,
infection with pathogens can sometimes trigger allergic
reactions and worsen asthma
...

Breathlessness, fatigue, tiredness
...
A
malignant tumour spreads to other parts of the body
when cells break off and travel in the bloodstream to form
secondary tumours

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