Electron transport chain

Question 1

Comes after Krebs cycle in respiration

Answer 1

Electron Transport Chain

Question 2

3 functional components Electron Transport Chain

Answer 2

Initial substrate oxidoreductase (or dehydrogenase)
Mobile electron carrier
Terminal oxidoreductase (*)
ETC can have more than 3 components

Question 3

Step 1 Initial substrate oxidoreductase (or dehydrogenase)

Answer 3

Oxidize 1 substrate and reduce another

Question 4

Mobile electron carrier

Answer 4

Quinone pool

Question 5

Reaction centers in ETC components contain:

Answer 5

Metal ions (iron and copper)
Double bonds and heteroaromatic rings

Question 6

heteroaromatic rings

Answer 6

aromatic rings that contain noncarbon atoms

Question 7

what does electron transport chain do

Answer 7

Reduced electron carriers drop off electrons
electrons “fall down” chain
Oxidation/reduction reactions
Generates pH gradient and electrochemical gradient (PMF)
electron passed to final electron acceptor

Question 8

what generates pH gradient and electrochemical gradient (PMF)

Answer 8

H+ pumped across membrane as electrons fall down chain

Question 9

location of electron transport chain ETC

see slide 40

Answer 9

membrane

Question 10

what happens to the Reduction potential as ETC goes along

see slide 41

Answer 10

goes from electron donors to electron acceptors

reduction potential increases (E0’)

Question 11

best electron acceptor

Answer 11

oxygen

Question 12

ATP synthase is considered

ATPase

Answer 12

is considered a part of the electron transport chain,

but it is not involved in the transport of electrons

Question 13

Some info about ATP synthase

Answer 13

Reversible
Chemiosmosis (oxidative phosphorylation)
H+ pass through F0 (rotates) causing torque on F1

Question 14

components of ATP synthase

see slide 42

Answer 14

F1 – cytoplasm (or matrix or stroma)

F0 – membrane (cytoplasmic or inner mitochondrial, or thylakoid)

Question 15

How much ATP in prokaryotic aerobic respiration

Answer 15

38 from 1 glucose

Question 16

How many ATP from each steps of respiration

Answer 16

8 atp glycolsis

30 ATP krebs

Question 17

What is step of glycolysis

Answer 17

1 glucose (6 carbon) to 2 pyruvate (3 Carbon)

Question 18

what is change in Krebs

Answer 18

2 pyruvate (3 carbon) to 6 CO2

Question 19

How many NADH from each step

Answer 19

glycolysis 2

Krebs 6

Question 20

Where is FADH2 produced

Answer 20

2 in Krebs cycle

Question 21

in eukaryotic how many ATP

Answer 21

36 to 38

Question 22

Why is number of ATP different in prok to eukary

Answer 22

In eukaryotic cells, maximum yield of ATP per glucose is 36 to 38,
depends on how 2 NADH generated in the cytoplasm during glycolysis enter the mitochondria
whether the resulting yield is 2 or 3 ATP per NADH.

Question 23

How many NADH and FADH2 are produced by ATP

Answer 23

3 ATP/1 NADH; 2 ATP/1 FADH2