4. ETC and Oxidative Phophorylation

Question 1

what is the electron transport chain?

Answer 1

electrons carried through the proteins to drive the proton gradient across the inner mitochondrial membrane

Question 2

what is oxidative phosphorylation?

Answer 2

the proton gradient runs downhill to drive the synthesis of ATP.

Question 3

How many complexes make up the ECT?

Answer 3

5

Question 4

Which complex cannot pump protons through the membranes like the rest of them?

Answer 4

complex II

Question 5

what is the process of the electron transport chain?

Answer 5

1. NADH from TCA gives its electron through complex I and passes it to ubiquinone. Complex I can then pump protons.
2. Complex II receives an electron from FADH2 which is then passed onto ubiquinone (Q)
3. The electrons from Q pass through complex III to cytochrome C. Complex III can then pump protons
4. Cytochrome C then passes the electrons through complex IV back into the matrix where it combines with O2 and bonds to 2H to form water.
5. The protons are pumped back through complex V into the matrix to form ATP

Question 6

What shuttles are used to transport the proton across the membrane to enter the interstitial space

Answer 6

Malate aspartate shuttle

Glycerophosphate shuttle