B1.9 - Active Transport

Question 1

Active transport

Answer 1

• moves substances needed by cell

- against a concentration gradient

Question 2

Why is active transport useful

Answer 2

-allows nutrients to be collected from areas of low concentration (soil) and transported to areas of high concentration (cytoplasm)

Question 3

What does active transport allow the cell to do

Answer 3

• absorb ions from very dilute solutions

- enables cell to move substances through cell membrane

Question 4

Energy for active transport

Answer 4

• energy required to move molecules back/forth across membrane
• produced by cell respiration
• many mitochondria to release energy

Question 5

Active transport in root hair cells

Answer 5

• used to absorb minerals from the soil
• absorbs from very dilute solutions
• carries ions against the concentration gradient

Question 6

Active transport in the small intestine

Answer 6

• enables sugars used for cell respiration to be absorbed
• from a lower concentration (gut)
• into an area of higher concentration (blood)