unit 1 key area 2 passive transport, diffusion and osmosis

Question 1

describe passive transport.

Answer 1

Passive transport occurs down a concentration gradient and doesn’t need energy
there are two examples of passive transport which area diffusion and osmosis
A concentration gradient is the difference between the concentrations in two areas

Question 2

diffusion always moves …………. A concentration gradient, for an area of ……….. Concentration to an area of ……….. concentration.

Answer 2

Down
high
Low

Question 3

what are the substances that diffuse into cells? (4)

Answer 3

Oxygen
CO2
Glucose
Amino acids

Question 4

what are the substances that diffuse out of cells?(3)

Answer 4

CO2
Oxygen
Urea

Question 5

osmosis is the movement of ……… molecule From an area of high ……… concentration to an area of low ………… concentration, across a ………….. ……………. Membrane. Osmosis is a ………. Prossess- doesn’t require energy

Answer 5

water
water
water
selectively permeable
passive

Question 6

when two solutions differ in water concentration there is a concentration gradient between them.
The solution with the higher water concentrations is called……………
The solution with the lower water concentration is called……………
If the solutions are equal water concentration they are called……………

Answer 6

hypotonic
hypertonic
isotonic