Mitochondrial electron transport system

Question 1

Travel of electrons through the inner mitochondrial membrane?

Answer 1

Enter at complex I, flow to CoQ, complex III and then complex IV

Question 2

How many H+ are concomitantly translocated?

Answer 2

10

Question 3

How many H+ are translocated via compelx I?

Answer 3

4

Question 4

How many H+ are translocated by complex II?

Answer 4

4

Question 5

How many H+ are translocated by complex III?

Answer 5

2

Question 6

Where does FADH2 enter the ETC?

Answer 6

Complex II

Question 7

What does FADH2 not do regarding the proton gradient?

Answer 7

Contribute to it

Question 8

What is complex I called?

Answer 8

NADH-Ubiquinone Oxidoreductase

Question 9

Where do the e- that enter complex I come from?

Answer 9

NADH

Question 10

How do e- move through complex I?

Answer 10

They move through inorganic cofactors

Question 11

How do the inorganic cofactors in CI remain in place?

Answer 11

They are covalently bound to the protein

Question 12

What is flavin mononucleotide (FMN) used for in CI?

Answer 12

It accepts 2 e- from NADH

Question 13

What does FMN accept (other than e-) and what does it form?

Answer 13

2 H+, forming FMNH2

Question 14

What is the intermediate formed between FMN and FMNH2?

Answer 14

Semiquinone intermediate

Question 15

Where do e- go after forming FMNH2?

Answer 15

Through Fe-S clusters

Question 16

How many electrons transferred per Fe-S cluster?

Answer 16

1

Question 17

How many different types of Fe-S clusters are there?

Answer 17

2, 2Fe-S