Transport Across Cell Membranes

Question 0

Give 2 passive processes by which substances pass through membranes

Answer 0

Diffusion and Osmosis

Question 1

Name 2 substances present in cell membranes

Answer 1

Proteins and Lipids

Question 2

State the difference between an active process and a passive process

Answer 2

Active processes require energy, passive ones don’t

Question 3

State one difference between Osmosis an Diffusion

Answer 3

Osmosis only involves water molecules an occurs through membranes

Question 4

Give the meanings of Turgid and Plasmolysed

Answer 4

Turgid- plant cells stretched, full of water

Plasmolysed- plant cells shrunken, through loss of water

Question 5

Give an example of a situation in which cells are used in active transport

Answer 5

Plant root cells taking up ions from their environment; nerve cells transporting potassium and sodium

Question 6

State what is meant by a Concentration Gradient

Answer 6

The difference in concentration between 2 areas