Movement in and out of cell

Question 1

Diffusion

Answer 1

the spread out of the particles resulting in a net movement of an area of higher concentration to lower concentration

Question 2

What is a small molecules?

Answer 2

oxygen, glucose, amino acids and water

Question 3

What is a large molecule?

Answer 3

starch and proteins

Question 4

Single- celled organism

Answer 4

can use diffusion to transport molecules into their body from the air.

Question 5

Multi- celled organism

Answer 5

the surface area to volume ratio is small so they rely on diffusion alone.

Question 6

Factors that may effect diffusion

Answer 6

Concentration gradient - greater the difference in concentration, the faster the rate of diffusion.
Temperature - greater the temp the greater the particles
Surface area - greater surface area faster the rate of diffusion
Distance - further the particles have to travel longer

Question 7

Osmosis

Answer 7

the movement of water from a less concentrated solution to a more concentrate one through a partially permeable membrane.

Question 8

Osmosis in animals

Answer 8

if the external solution is more dilute, it will move into animal cells causing them to burst.
If more concentrated it will become shrivelled

Question 9

Active transport

Answer 9

is the movement of particles from an area of low concertation to high concentration. (against concentration gradient)

Question 10

active transportation in root hair cells

Answer 10

take up water and mineral ions from soil.
mineral ions usually in higher concentrations in cells, meaning diffusion cannot take place..
requires energy from respiration to work.

Question 11

active transport in the gut

Answer 11

substances such as glucose and amino acids from your food have to move from your gut to blood stream.
Required to move sugar to the blood against its concentration