oxidative phosphorylation: ETS lecture 14

Question 1

where does it occur

Answer 1

inner mitochondrial membrane.

Question 2

the inner membrane is intrinsically impermeable to nearly all ions and polar molecules: how do our desired molecules get in?

Answer 2

A large family of transporters shuttle metabolites such as ATP, pyruvate, and citrate across the inner mitochondrial membrane.

Question 3

overview of what happens in ox phosphorylation?

Answer 3

In oxidative phosphorylation, electrons from NADH and FADH2 are used to re-
duce molecular oxygen to water.

Question 4

which complex doesn’t pump protons?

Answer 4

2

Question 5

which complex is involved in krebs

Answer 5

2

Question 6

why do FADH2 derived electrons yield less ATP than NADH?

Answer 6

electrons from FADH2 feed into the chain “downstream” of those from NADH because the electrons of FADH2 have a lower reduction potential. As a result, FADH2-derived electrons pump fewer protons and thus yield fewer molecules of ATP.