EASY
AS and A Level
IMPORTANT
Earn 100
State two examples where the surface area of membranes has been increased by folding. For each example, state why the increased surface area is an advantage.
Important Questions on Cell Membranes and Transport
EASY
AS and A Level
IMPORTANT
Give an example of a cell organelle that is surrounded by single membrane.
EASY
AS and A Level
IMPORTANT
Give an example of a cell organelle that is surrounded by two membranes.
HARD
AS and A Level
IMPORTANT
Prepare a table to summarise briefly the major functions of phospholipids, cholesterol, glycolipids, glycoproteins and proteins in cell surface membranes.
MEDIUM
AS and A Level
IMPORTANT
Why does the cell surface membrane not provide a barrier to the entry of hydrophobic molecules into the cell?
MEDIUM
AS and A Level
IMPORTANT
Suggest three reasons why exchange between the cell and its environment is essential.
HARD
AS and A Level
IMPORTANT
Calculate the surface area, volume and surface area to volume ratio of each of the cubes.
HARD
AS and A Level
IMPORTANT
The fact that the surface area to volume ratio decreases with the increasing size is also true for whole organisms. Explain the relevance of this for transport systems within organisms.
MEDIUM
AS and A Level
IMPORTANT
In Figure 'b', the system has come into equilibrium, so there is no net movement of water molecules. What can you say about the water potentials of the two solutions A and B?
