Cell Transport and Osmosis

Question 1

Define Passive transport

Answer 1

Passive transport describes the movement of molecules
across the plasma membrane WITHOUT the use of any
energy.

Question 2

What are the 3 types of Passive Transport

Answer 2

1. (simple) Diffusion
2. Facillitated Diffusion
3. Osmosis

Question 3

What is (simple) Diffusion

Answer 3

The passive movement of small uncharged molecules that move across the plasma membrane, down the concerntration gradient

Question 4

What is facilitated diffusion

Answer 4

Facilitated diffusion is the passive movement of molecules down the concerntration gradient with the help of a membrane bound protien.

Question 5

What are the 2 methods of Facilitated diffusion? Give function of two methods.

Answer 5

1. Protien channel: a membrane bound protien that selectively transports large polar molecules.
2. Carrier Protien: A protien that changes shape to transport molecules through the membrane.

Question 6

Define Osmosis

Answer 6

Osmosis is the diffusion of water molecules across a
selectively permeable membrane due to concentration
differences.