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Cambridge AS & A Level Biology 9700 — Revision Notes

1 · Cell Structure

0/26

2 · Biological Molecules

0/51

3 · Enzymes

0/29

4 · Cell Membranes and Transport

0/41

5 · The Mitotic Cell Cycle

0/21

6 · Nucleic Acids and Protein Synthesis

0/22

7 · Transport in Plants

0/28

8 · Transport in Mammals

0/39

9 · Gas Exchange

0/13

10-11 · Infectious Disease and Immunity

0/43

12 · Energy and Respiration

0/37

13 · Photosynthesis

0/23

14-15 · Homeostasis and Control

0/57

16 · Inherited Change

0/34

17-18 · Selection, Evolution, Classification and Conservation

0/69

19 · Genetic Technology

0/44

Other lessons

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Quiz

4.1 Fluid Mosaic Membranes – Check yourself

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Fluid Mosaic Membranes Biology 9700 check yourself quiz: free practice for Cambridge AS & A Level Biology 9700. Work through this Fluid Mosaic Membranes Biology 9700 check yourself quiz and get instant feedback on every answer. If you get stuck, review the 4.1 Fluid Mosaic Membranes — 9700 Notes lesson. More practice: Cambridge AS & A Level Biology 9700 — all units. Syllabus: Cambridge AS & A Level Biology 9700 syllabus.

  • Questions count: 10
  • Passing grade: B
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1.

The fluid mosaic model describes the membrane as

a phospholipid bilayer with proteins scattered in it, the molecules free to move
a rigid layer of protein
a single layer of lipid
a cellulose layer
2.

Phospholipids form a bilayer because

heads repel water
tails are attracted to water
they are joined by covalent bonds
hydrophilic heads face water and hydrophobic tails face inwards
3.

Cholesterol in the membrane

transports ions
regulates fluidity and increases mechanical stability
acts as a receptor
is an enzyme
4.

Glycoproteins and glycolipids act as

enzymes for respiration
cell surface antigens and receptors
channels for water
energy stores
5.

In cell signalling, a ligand such as a hormone

enters every cell
destroys the membrane
binds to a specific receptor on the target cell
always binds to DNA
6.

Channel proteins

use ATP
carry lipids
change the cell’s shape
provide a hydrophilic pathway for ions to cross the membrane
7.

Increasing temperature makes membranes

more fluid and more permeable
more rigid
thicker
impermeable
8.

Unsaturated fatty acid tails make a membrane

less fluid
more fluid
thicker
impermeable to all substances
9.

The typical thickness of a cell surface membrane is about

7 μm
7 nm
70 nm
0.7 mm
10.

The stages of cell signalling in order are

response, binding, secretion
secretion of ligand, transport, binding to receptor, response
binding, secretion, transport
transport, response, secretion
Part of 4 · Cell Membranes and Transport — see every lesson and quiz in this unit.
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