AQA Past Papers Practice

Yeast cells can respire anaerobically.
0 1 . 3 Complete the word equation for anaerobic respiration in yeast.
Choose the answer (ethanol, glycerol, starch, urea.)

glucose → ………….. + carbon dioxide

This question is about white blood cells and pathogens.
White blood cells have cell membranes.
Describe the function of the cell membrane.

Between which two groups is there the largest increase in death rate? box
Use Table 1.

Yeast can also respire aerobically.
Complete the sentence to give one way in which aerobic respiration is different from anaerobic respiration

Choose the answer (carbon, energy, oxygen, glucose)

Aerobic respiration releases more ………………………than
anaerobic respiration.

The allele for white flower colour is recessive.
Describe how Figure 10 shows that a recessive allele causes white flower colour

What does anaerobic mean?

What is the optimum pH for pectinase?

Vaccination of a large proportion of the population will help to protect those who are
not vaccinated.
Give a reason why

The brain monitors core body temperature.
Name the centre in the brain that monitors core body temperature.

Skin cells contain many ribosomes.
Suggest why ribosomes are not visible in Figure 6.

People must be vaccinated with a new vaccine each year to prevent infection from
influenza.
Explain why a new vaccine is used each year.

Brain cells can be damaged by toxins.
Liver failure can cause brain damage.
Explain how liver failure can cause brain damage.

Label parts B on Figure 1.

Name a technique which could be used to quickly produce large numbers of the
genetically engineered plants

Tardigrades can reproduce both sexually and asexually.
During asexual reproduction, the female produces offspring from eggs which have not
been fertilised.
Give one advantage to the female if she does not need to find a mate.

Structures A, B, C and D are valves.
Which valve opens when the blood pressure in the right ventricle is greater than the
blood pressure in the pulmonary artery?
Write the correct letter

Which parts of the cell release energy during respiration?

A leaf is a plant organ.
Name two other plant organs.

Explain why a person with a faulty heart valve can feel very tired.

Uncontrolled cell division causes tumours to form.
A tumour can be malignant or benign.
select two features of malignant tumours that make them different from benign tumours.

Tardigrades can survive in extremely cold and dry conditions.
In extreme conditions, tardigrades have the following adaptations:
1. Produce a waxy layer to cover their body surface.
2. Curl up into a tiny ball.
3. Are light enough to be carried by the wind.
Describe how each adaptation helps the tardigrade to survive.
You should give a different reason for each adaptation.
Adaptation 1
Adaptation 2
Adaptation 3

Ebola is a disease caused by a viral pathogen.
The Ebola virus attaches to the cell membranes of some body cells.
The Ebola virus can spread very quickly by direct contact with infected patients or
their body fluids

Choose one other way to reduce the spread of the Ebola virus.

Research shows that tobacco smoke increases the risk of a tumour forming.
Choose one other factor that increases the risk of a tumour forming

The size of the stomata can be controlled.
What parts of the leaf control the size of the stomata?

Metabolism is the name given to all chemical reactions in the body.

Name the chemical reaction in the body that releases energy

Digestive enzymes break down insoluble molecules into smaller, soluble molecules.
Name two insoluble molecules digested by enzymes.
Choose the answers (amino acid, fat, fatty acid, glucose, protein)