18.4 Oxidative phosphorylation

Question 1

What happens to the H picked up by FAD and NAD in previous stages of respiration?

Answer 1

H are delivered to electron transport chains in cristae’s membranes

Question 2

What happens during oxidative phosphorylation?

Answer 2

1. H atoms dissociate into H ions and electrons
   The electrons are used in synthesis of ATP by chemiosmosis
2. Energy is released during redox reactions where electrons oxidise and reduce electron carriers as they move along the ETC
3. The energy’s used to create a proton gradient, leading to diffusion of protons through ATP synthase, resulting in ATP synthesis
4. At end of ETC, electrons combine wit H ions and O2 to form H20

Question 3

What the is the final electron acceptor in respiration?

Answer 3

O2

Question 4

What is oxidative phosphorylation?

Answer 4

Phosphorylation of ADP to ATP dependent on the movement of electrons along the ETC and requiring oxygen.

Question 5

What is substrate level phosphorylation?

Answer 5

Production of ATP involving transfer of phosphate from a short live highly reactive intermediate