1.2 Transport Across Cell Membranes

Question 1

What does the cell membrane consist of?

Answer 1

Phospholipids and proteins

Question 2

The cell membrane is (a) fully permeable, (b) selectively permeable, (c) not
permeable.

Answer 2

(b) selectively permeable

Question 3

What does passive transport mean?

Answer 3

Down the concentration gradient and does not require energy

Question 4

Give 2 examples of passive transport in cells.

Answer 4

Diffusion and osmosis

Question 5

What is diffusion?

Answer 5

The movement of molecules down the concentration gradient from a higher to a
lower concentration.

Question 6

What is osmosis?

Answer 6

The movement of water molecules from a high water concentration to a low water
concentration through a selectively permeable membrane.

Question 7

What will animal cells in low water concentration do?

Answer 7

Shrink

Question 8

What will animal cells in high water concentration do?

Answer 8

Burst

Question 9

What will plant cells in low water concentration become?

Answer 9

Become Plasmolysed

Question 10

What will happen to animal cells in a high water concentration?

Answer 10

burst