Key Area 1.2 - Transport across cell membranes

Question 1

A difference of concentration of a substance is called…

Answer 1

A concentration gradient

Question 2

The cell membrane is composed of…

Answer 2

Protein and Lipids

Question 3

Describe Diffusion

Answer 3

The movement of of molecules from a high concentration to a lower concentration, down a concentration gradient

Question 4

The two types of passive transport processes…

Answer 4

Diffusion and Osmosis

Question 5

Describe Active Transport

Answer 5

The movement of molecules from a low concentration to a high concentration against a concentration gradient. Requires energy.

Question 6

What is the meaning of turgid?

Answer 6

A swollen plant cell with a full vacuole resulting from water intake due to osmosis.

Question 7

What is the meaning of plasmolysed?

Answer 7

A plant cell which the vacuole has shrunk and the membrane has pulled away from the wall due to water loss.

Question 8

Describe Osmosis

Answer 8

The movement of water from a high concentration to a low concentration. Down the concentration gradient. Doesn’t require energy.