Transport across membranes

1

What are the two main components of cell membranes?

2

A glucose molecule diffuses out of a cell through the selectively permeable cell membrane. What is this an example of?

3

The diagram shows three animal cells. Pairs of red circles represent oxygen molecules.

Three animal cells. Cell 1 has 6 pairs of oxygen molecules. Cell 2 has 7 pairs of oxygen molecules and cell 3 has 4 pairs of oxygen molecules.

Between which two cells is there the highest oxygen concentration gradient?

4

The diagram shows three plant cells and the solute concentrations of their cell solutions.

Three plant cells.  Cell 1 has a solute concentration of 0.8%, cell 2 has a solute concentration of 0.7% and cell 3 has a solute concentration of 0.6%

Between which cells will the movement of water by osmosis occur?

5

What may happen to red blood cells placed in distilled (pure) water?

6

Which structure can prevent a plant cell from bursting when it gains water by osmosis?

7

What will happen when plant cells are placed in distilled (pure) water?

8

The diagram shows a cube of potato, (P), in a beaker containing a solution containing a very high sugar concentration (R)

A beaker filled with a concentrated sugar solution - R.  A cube of potato - P - is in the beaker.

After one hour, what will have happened to cube P?

9

What could cause a plant cell to become plasmolysed?

10

Which of the following processes requires energy to occur?