Topic 1

Question 1

Function of the Plasma Membrane

Answer 1

Selectively controls the entry and exit of substances
Establishes compartments within the cell
Restricts the movement of substances within the cell
Has receptors involved in intracellular communication
Involved in cell recognition and adhesion to form tissues
Produce electrical activity in excitable cells

Question 2

As a cell gets larger it’s SA:V becomes…

Answer 2

Smaller/decreases

Question 3

As a cell gets smaller it’s SA:V becomes…

Answer 3

Larger/increases

Question 4

Define Simple Diffusion

Answer 4

The net movement of a substance across the phospholipid bilayer from a region of high solute concentration to low solute concentration of that substance.

Question 5

Define Osmosis

Answer 5

The net movement of water from a region of low solute concentration to high solute concentration across a semipermeable membrane.

Question 6

A solution is hypotonic when…

And the movement is…

Answer 6

It’s solute concentration is lower than that of the cell

There is a net movement of water into the cell

Question 7

A solution is hypertonic when…

And the movement is…

Answer 7

It’s solute concentration is higher than that of the cell

There is a net movement of water out of the cell

Question 8

What is it called when animal cells burst?

Answer 8

Haemolysis

Question 9

What is it called when plant cells shrink?

Answer 9

Plasmolysis

Question 10

What is it called when animal cells shrivel?

Answer 10

Crenation

Question 11

Define Active Transport

Answer 11

The net movement of substances from a region of low concentration to high concentration.