ETC

Question 1

is ETC aerobic/anaerobic

Answer 1

aerobic (only in presence of O2)

Question 2

ETC location

Answer 2

cristae of inner mitochondrial membrane

Question 3

ETC: names of protein complexes 1, 3, 4

Answer 3

1: NADH dehydrogenase
3. Cytochrome bc
4. Cytomechrome c oxidase

Question 4

ETC electrons being transferred

Answer 4

coenzyme q: transfers e from complexes I and II to III
cytochrome C: transfers e from III to IV

Question 5

where are protons being pumped

Answer 5

protons enter matrix through channels w ATPase

O2 final electron and H acceptor

Question 6

Chemiosmos:

Answer 6

diffusion of ions across a membrane

Question 7

chemiosmosis + ATP production

Answer 7

proton gradient built so H can flow thru ATP synthase to build ATP (chemios. links ETC to ATPase)

Question 8

total ATP created from respiration

Answer 8

~38

Question 9

concentration gradients: after ATP synthase, protons

Answer 9

accumulate in intermembrane space, creating electrochemical gradient to store free energy/proton motive force/PMF

Question 10

two components of electrochemical gradient

Answer 10

electrical + chemical

Question 11

how many protons pumped by NADH and FADH2

Answer 11

NADH: 3 into intermembrane
FADH2: 2 into intermembrane

Question 12

when O2 not available:

Answer 12

ETC backs up (nothing to pull e down chain, carriers can’t unload H), ATP production ceases, cells run out of energy

Question 13

substrate level phosphorylation:

Answer 13

ATP formed directly (enzyme-catalyzed reaction) (phosphate compound transfers phosphate directly to ADP)

Question 14

oxidative phosphorylation:

Answer 14

ATP formed indirectly (sequential redox reaction: O final e acceptor)