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Course: AQA A Level Biology 7402
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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

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Quiz

2.4.1 The Structure of Cell Membranes – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
Real cell membranes let water through far faster than the artificial bilayer in the table. Why?
Real membranes have no phospholipids
Water is non-polar in cells
Real membranes contain aquaporin channel proteins
Cholesterol pumps water
2.
Oxygen crosses membranes mainly by:
Active transport
Carrier proteins
Endocytosis
Simple diffusion through bilayer
3.
Cholesterol in membranes:
Regulates fluidity
Transports glucose
Acts as a receptor
Forms channels
4.

The typical thickness of a cell surface membrane is about

7 μm
7 nm
70 nm
0.7 mm
5.

Small nonpolar molecules such as O₂ and CO₂ cross the membrane by

simple diffusion
active transport
endocytosis
ion channels
6.
Cholesterol molecules in an animal cell membrane
transport glucose
act as receptors for hormones
reduce changes in fluidity when temperature changes
form channels for ions
7.
Which statement correctly describes cell membrane?
the material where many cell reactions occur
the structure that controls cell activities
structures where aerobic respiration releases energy
the boundary controlling movement into and out of a cell
8.
Red blood cells in distilled water will:
Shrink
Stay the same
Plasmolyse
Burst
9.

A cell placed in a hypertonic solution will

gain water
stay the same
lose water
burst
10.

Plant cell walls

provide structural support and limit expansion
are selectively permeable membranes
contain phospholipids
pump ions
11.
A cell with a true nucleus and membrane-bound organelles is a _____.
prokaryote
virus
nucleoid
eukaryote
12.
All cells share a plasma membrane, cytoplasm, ribosomes and DNA. True or false?
False
True
False, prokaryotes lack ribosomes
True only for eukaryotes
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Part of 2. Cell Structure — see every lesson and quiz in this unit.
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