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Question 1

What is meant by the term concentration gradient?

Answer 1

The difference in concentration that exists between a region of high concentration and a region of low concentration

Question 2

Define diffusion

Answer 2

The movement of molecules from a region of high concentration to a region of low concentration

Question 3

What is osmosis

Answer 3

Osmosis is the movement of water from an area of high water concentration to an area of low water concentration through a selectively permeable membrane

Question 4

What is a plasmolysed cell?

Answer 4

A plasmolysed cell is one where the cell membrane and contents have pulled away from the cell wall

Question 5

What is a turgid cell?

Answer 5

A turgid cell is where the cell membrane and contents are pushed firmly against the cell wall

Question 6

What happens to animal cells when they gain or lose to much water?

Answer 6

Animal cells burst if they gain too much water and shrink if they lose to much water

Question 7

What is active transport?

Answer 7

Active transport is the movement of molecules and ions across a membrane, from a region of low concentration to a region of high concentration (i.e against the concentration gradient)

Question 8

Cells that use active transport have what?

Answer 8

A larger number of mitochondria because active transport requires energy input to occur