Oxidative Phosphorylation

Question 1

What is the first thing that happens in this stage of respiration?

Answer 1

the reduced molecules (e.g NADH) will release their H which splits into H+ and electrons

Question 2

What happens to the electrons that are released?

Answer 2

they travel along an electron transport chain which releases energy

Question 3

What is the energy released (in the electron carrier chain) used for?

Answer 3

actively transporting H+ out of the matrix into the inter-membrane space

Question 4

what does the active transport of H+ ions create?

Answer 4

an electrochemical gradient

Question 5

How do protons move back into the matrix?

Answer 5

facilitated diffusion through ATP synthase

Question 6

What does ATP synthase do?

Answer 6

Phosphorylate ADP to form ATP

Question 7

What does oxygen pick up in this step?

Answer 7

electrons and H+ ions, forming H2O

Question 8

What is oxygens role in respiration?

Answer 8

it is the final electron acceptor and will form water

Question 9

Why do muscle cells have more cristae in mitochondria?

Answer 9

• muscle cells use more ATP
• larger SA for more oxidative phosphorylation
• so more ATP produced

Question 10

What is the role of carrier proteins and coenzymes in producing ATP?

Answer 10

• NADH and FADH deliver electrons and H+ ions to cristae
• electrons are picked up by carrier proteins in ETC
• release energy, so H+ ions pumped, creating conc. gradient so can diffuse through ATP synthase
• forming ATP