Topic 1 : Movement into and out of cells

Question 1

Define diffusion

Answer 1

The net movement of particles from an area of low concentration to an area of high concentration

Question 2

Is diffusion an active or passive process?

Answer 2

Passive

Question 3

What are the 3 factors affecting diffusion?

Answer 3

• temperature
• surface area of molecule
• concentration gradient

Question 4

Define osmosis

Answer 4

The movement of water molecules from an area of high water concentration to an area of low water concentration, through a partially permeable membrane

Question 5

Is osmosis active or passive

Answer 5

passive

Question 6

Define active transport

Answer 6

Active transport is where substances move from an area of low concentration to high concentration.

Question 7

Is active transport passive or active and describe concentration gradient

Answer 7

active, meaning it requires energy and it goes against the concentration gradient

Question 8

How does active transport work?

Answer 8

Transport proteins are used to pick up ions or molecules or atoms from near the cell membrane, which then performs active transport.

Question 9

give examples of active transport

Answer 9

respiration, when plants absorb mineral ions

glucose is absorbed to the blood from the small intestine