Question

Which of the following statements about cytochrome c is TRUE?

a)cytochrome c shuttles electrons between the NADH dehyfrogenase complex and cytochrome c reductase complex
b) when cytochrome C becomes reduced two cytosines become covalently bound
c)cytochrome c shuttles electrons between the cytochrome c reductase complex and the cytochrome c oxidase complex
d) cytochrome c is the last protein in the electron transport chain passing its electrons directly to molecular oxygen

Answer 1

The correct statement is option c) cytochrome c shuttles electrons between the cytochrome c reductase complex and the cytochrome c oxidase complex.

Step-by-step explanation:

Cytochrome c is an electron carrier protein that shuttles electrons between complex III (cytochrome c reductase complex) and complex IV (cytochrome c oxidase complex) in the electron transport chain. It accepts electrons from coenzyme-Q and transfers them to cytochrome c oxidase, the last protein in the electron transport chain that passes its electrons to molecular oxygen, forming water.

This transfer of electrons by cytochrome c is crucial for generating a proton gradient and ATP synthesis during cellular respiration.