PROBLEM SET 7A. ET and OX Phos

PROBLEM SET 7A

Electron Transport System and Oxidative Phosphorylation

This problem set and the next deal with principles of electron transport and synthesis of ATP

1. What is the purpose of the electron transport system?
2. From the  equation:

0.53 ATP-4 + 0.47 ATP-3 + H2O = 0.68 ADP-3 + 0.32 ADP-2 + 0.67 Pi-2 + 0.33 Pi-1 + 0.82 H+
ΔGº’ = – 7,300 cal/mol at 25º C

Calculate ΔGº for the reaction. What can you conclude?

3. The electron transport system contains five distinct protein complexes.
a. How does complex II differ functionally from I, III and IV?
b. How does complex V differ functionally from the others?

4. Which complex oxidizes NADH?

5. Which complex oxidizes FADH2?

6. Explain why  NADH produces three ATPs while FADH2 produces only two.

7. How are electrons passed from complex I to II?

8.  How are electrons passed from complex III to IV?

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