SB1i - Transporting Substances: Active Transport

Question 1

What is active transport?

Answer 1

When substances are absorbed against the concentration gradient

Question 2

What does active transport require?

Answer 2

Energy from respiration

Question 3

How is active transport different to diffusion?

Answer 3

Active transport moves against the concentration gradient and requires energy from respiration

Question 4

What is the cavity of small intestines where food is digested?

Answer 4

The lumen

Question 5

What is the concentration of sugars in the lumen compared to that in a cell?

Answer 5

Lower so the sugars can’t be diffused into the cell

Question 6

How do sugars get to the blood stream?

Answer 6

By the sugars being carried in to the lumen by active transport and then transported into the blood stream

Question 7

What do root hair cells do?

Answer 7

Transport ions such as magnesium into the plant from the soil

Question 8

Give an example of how active transport if used in plants

Answer 8

Magnesium ions are in lower concentration outside a root hair cell than in the cell so active transport allows the ions to be carried in which can be transported into the leaves

Question 9

How do poisons like cyanide work?

Answer 9

They stop mitochondria carrying out aerobic respiration causing active transport to slow and stop

Question 10

What is a respiration inhibitor?

Answer 10

A substance that stops aerobic respiration from being carried out by mitochondria