Electron Transport Complexes

Question 1

Complex I

NADH-Ubiquinone Oxidoreductase Complex

Answer 1

Substrates: NADH, H⁺, Q

Products: NAD⁺, QH₂

of Protons Entering: 6

Leaving: 4

Prosthetic groups: Fe-S Iron sulfur clusters, and FMN

Question 2

Complex II

Succinate-Ubiquinone Oxidoreductase Complex

Answer 2

Substrates: Succinate, Q

Products: Fumarate, QH₂

of protons entering: 2

Leaving: 0

Prosthetic groups: Fe-s clusters, FAD, cytochrom b

Question 3

Complex III

Cytochrom C Oxidoreductase Complex

Answer 3

Substrates: QH₂ Cytochrom C (Ox)

Products: Q, Cytochrom C (red)

of protons entering: 2

leaving: 4

Prosthetic groups: Fe-s clusters, cytochrom b high and low, cytochrom c-1

Question 4

Complex IV

Cytochrom C Oidase Complex

Answer 4

Substrates: Cytochrom C (red) O₂

Products: Cytochrom C (ox) H₂O, Cu 2+

of protons entering: 2

Leaving: 2

Prosthetic groups: Cytochrom A-1 and A-3 Cu 2+ A and B

Question 5

Complex V

ATP synthase

Answer 5

Substrates: ADP, Pi

Products: ATP

of protons entering: 3

leaving: 3

Prosthetic groups: None