Curriculum
Course: AQA A Level Biology 7402
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Curriculum

AQA A Level Biology 7402

1. Biological Molecules

0/102

2. Cell Structure

0/95

3. Exchange and Transport

0/98

4. Genetics, Variation and Interdependence

0/94

5. Energy Transfers In and Between Organisms (A Level only)

0/63

6. Organisms Respond to Changes in their Environments (A Level only)

0/93

7. Genetics, Populations, Evolution and Ecosystems (A Level only)

0/55

8. The Control of Gene Expression (A Level only)

0/72

9. Exam Guidance and Skills

0/38
Quiz

2.4.7 Required Practical- Factors Affecting Membrane Fluidity – Exam questions

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  • Questions count: 5
  • Passing grade: B+
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1.
Membrane fluidity with and without cholesterol is shown. Which conclusion fits?
Cholesterol reduces fluidity when warm and increases it when cold
Cholesterol always increases fluidity
Cholesterol always decreases fluidity
Cholesterol has no effect
2.
What happens to membrane fluidity if phospholipids contain more unsaturated fatty acids?
It decreases
It increases
No change
The membrane solidifies
3.
Which method best shows that cholesterol affects fluidity?
Measure one cell at one temperature
Add sugar to membranes
Compare leaves and roots
Measure fluidity of artificial membranes with and without cholesterol at several temperatures
4.
Which pairing of change and effect on fluidity is correct?
More saturated tails — more fluid
Lower temperature without cholesterol — more fluid
Fewer kinks — more fluid
More unsaturated tails — more fluid
5.
Membrane fluidity allows vesicles to fuse and punctures to reseal. True or false?
False
False, fluidity prevents fusion
True
True only in plants
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Part of 2. Cell Structure — see every lesson and quiz in this unit.
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