Transport Across The Cell Membrane

Question 1

Definition of diffusion

Answer 1

Diffusion is the movement of molecules from a region of high concentration to a region of low concentration, down the concentration gradient, through a selectively permeable membrane until the concentrations are equal

Question 2

Definition of osmosis

Answer 2

Osmosis is the movement of water molecules from a region of high water concentration to a region of low water concentration, down the concentration gradient, through a selectively permeable membrane until the concentrations are equal

Question 3

Definition of active transport

Answer 3

Active transport is the movement of molecules from a region of low concentration to a region of high concentration, against the concentration gradient, through a selectively permeable membrane

Question 4

Active transport is carried out by…

Answer 4

Carrier proteins or protein pumps

Question 5

What are the two effects of osmosis in plant and animal cells?

Answer 5

Animal- shrinks or bursts
Plant - turgid (full of water)
Plasmolysed (vacuole shrinks)

Question 6

What is the cell membrane made of?

Answer 6

Proteins and 2 layers of phospholipids