Transport

Question 1

Describe facilitated diffusion

Answer 1

Down a concentrated gradient
Involves carrier or channel protein
Does not require ATP

Question 2

Describe active transport

Answer 2

Use of carrier proteins

Molecules move against concentration gradient so process requires ATP

Question 3

Roots dipped in chloride ions. Respiratory inhibitor on plant A. Explain difference in results

Answer 3

Plant A- Diffusion only. Rate levels off as cells reach equilibrium
Plant B- Diffusion and active transport
No equilibrium reached
Rate slows as fewer chloride ions in external solution

Question 4

Describe the role of haemoglobin in supplying oxygen to the tissues of the body

Answer 4

Oxyhemoglobin formed

Oxygen unloaded

Question 5

What does it mean if O2 curve shifted to the right?

Answer 5

Haemoglobin has lower affinity for oxygen
Therefore oxygen released quicker
For respiration