Cellular Respiration: Electron Transport Chain

These flashcards cover key concepts related to the electron transport chain in cellular respiration, focusing on the roles of various complexes, electron transport mechanisms, and products formed during these processes.

What is the role of Ubiquinone (Q) in the electron transport chain?

Q transports electrons from Complex I and II to Complex III.

What are the products of the oxidation of NADH in the electron transport chain?

NAD+ and protons (H+).

What is formed when QH2 is oxidized?

Q, reduced cytochrome c, and H+.

What complex does cytochrome c transport electrons to?

Complex IV.

What is the net equation when QH2 is oxidized?

QH2 + 2H+ + Q + cytochrome c (reduced) → Q + 2cytochrome c (reduced) + 4H+.

What does Complex I do in the mitochondrial electron transport chain?

It catalyzes the transfer of electrons from NADH to Q.

What are the two reducing equivalents mentioned that enter the electron transport chain?

NADH and FADH2.

What is produced as a result of the full reduction of Q?

QH2.

How many protons (H+) are pumped into the intermembrane space by Complexes I, III, and IV combined?

Approximately 10 protons are pumped across the membrane.

What is the final electron acceptor in the electron transport chain?

Oxygen (O2).