Mitochondrial ET

Question 1

what is the overall balanced reaction for this (excluding complex II)

Answer 1

NADH + 1/2O2 + 11H –> NAD + H2O + 10H

Question 2

Where are Complex I and Complex II located?

Answer 2

in lipid membrane

Question 3

Where are Complex III and Complex IV located?

Answer 3

In Intermembrane space (IMS)

Question 4

What does Complex I do?

Answer 4

pump protons across membrane

Question 5

Where do electrons move in complex I?

Answer 5

move from NADH to FMN, then through FeS clusters

Question 6

What is the balanced reaction for complex I?

Answer 6

NADH + H + Q –> NAD + QH2

Question 7

What does Complex II do?

Answer 7

makes fumarate from succinate and Q into QH2

Question 8

What does Complex III do?

Answer 8

QH2 is oxidized and 2H is released into IMS

Question 9

What are the two paths in Complex III?

Answer 9

1. QH2 to cytc in IMS
2. QH2 to Q near matrix

Question 10

What is the balanced chemical reaction for Complex III?

Question 11

What does Complex IV do?

Answer 11

4H move across membrane per 4electrons

Question 12

How does electrons move in complex IV?

Answer 12

move from cytc through 4 redox centres to O2

Question 13

What is the balanced reaction for Complex IV?

Answer 13

4cytC(II) + 4H + O2 –> 4CytC(III) + 2H2O