17 (19.4) - Electron Transport Chain

Question 1

NADH used comes from where?

Answer 1

8 from TCA, 2 from glycolysis

Question 2

Where?

Answer 2

Mitchondria, between intermembrane space and the matrix (INNER mitochondrial membrane)

Question 3

What’s the terminal electron acceptor?

Answer 3

O2

Question 4

Aerobic or anaerobic?

Answer 4

Aerobic (bc terminal electron acceptor)

Question 5

Result of TCA (before ATP synthase)

Answer 5

Many protons in the intermembrane space (from pumping), causing an electrochemical gradient

Question 6

ATP synthase

Answer 6

Brings H+protons from IMS back in the matrix, creating 26-28 ATP in the process

Question 7

At complex I

Answer 7

NADH->NAD+ (reduction??), proton pumped across membrane, electrons to ubiquinone (q)

Question 8

At complex 2

Answer 8

FADH2->FAD+ (reduction??), NO PROTON PUMPED, e- lost to q

Question 9

At complex 3

Answer 9

E- passed to cytochrome C from ubiquinol, proton pumped

Question 10

At complex 4

Answer 10

e- passed to terminal acceptor (O2), water produced (02+4h+)

Question 11

AtP synthase is a ___ mechanism

Answer 11

Chemiosmotic mechanism

Question 12

How does atp synthase work

Answer 12

Proton movement causes the Stalk to turn like a turbine, driving the production of ATP

Question 13

What drops at electons travel down the chain?

Answer 13

The free energy