MEDIUM
AS and A Level
IMPORTANT
Earn 100
A plant tissue was placed in pure water at time zero. The rate of entry of water into the tissue was measured as the change in water potential with time. The graph shows the results of this investigation.
Describe and explain the results obtained.
Important Questions on Cell Membranes and Transport
EASY
AS and A Level
IMPORTANT
Why are all cells (prokaryotes and eukaryotes) surrounded by a cell surface membrane?
EASY
AS and A Level
IMPORTANT
What is the meaning of 'partially permeable' when applied to plasma membrane.
EASY
AS and A Level
IMPORTANT
Why are phospholipids important in membrane structure?
EASY
AS and A Level
IMPORTANT
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.
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?
