TRANSPORT ACROSS CELL MEMBRANES

Question 1

State what the cell membrane is made out off

Answer 1

Phospholipids and Proteins

Question 2

Whats Special about the cell membrane

Answer 2

The cell membrane is selectively permeable meaning only substances such as water, co2 and oxygen can pass through it freely

Question 3

State what diffusion is

Answer 3

Diffusion is the a passive movement of substances moving from and area of high concentration to and area of low concentration (down the concentration gradient)

Question 4

What is osmosis

Answer 4

Movement across the cell membrane from and area of low water concentration to an area of high water concentration

Question 5

Osmosis in animal cells-state what happens when a cell is placed in a HWC compared to its contents

Answer 5

the cell will gain water by osmosis and burst

Question 6

Osmosis in animal cells-state what happens when a cell is placed in a LWC compared to its contents

Answer 6

the cell will lose water by osmosis and shrink

Question 7

Osmosis in plant cells-state what happens to a plant cell placed in a HWC compared to its contents

Answer 7

The cell will gain water by osmosis,swell up and become turgid

Question 8

Osmosis in plant cells-state what happens to a plant cell placed in a LWC compared to its contents

Answer 8

the cells will lose water by osmosis and become plasmolysed

Question 9

State what active transport is

Answer 9

The movement of a substance from an area of Low concentration to an area of high Concentration against the concentration gradient

Question 10

What does active transport require

Answer 10

energy (ATP)