ETC Flashcards
List the components of the ETC in the order electrons transfer through them to the final ellectron acceptor.
Complex I/IIA/IIB → Q → III
→ (cytochrome C) → IV
Which of the ETC components is unique?
Quinone → made of lipids, not a protein
Redox reactions in the Fe- and Cu-containing
prosthetic groups involve:
A. Hydrides
B. H+ only
C. e- only
D. e- and H+
E. 2 e- and 2 H+
C. e- only
The riboflavin-derived prosthetic groups are:
A.FMN & FAD
B. FeS & CuS clusters
C. NADH
D.Complex III only
E. Complex I & Complex II
A.FMN & FAD
E. 2 e- and 2 H+
E. 2 e- and 2 H+
What does NADH donate to the ETC?
dont look at the photo yet!
NADH donates a Hydride (2e- & 1H+ )
to FMN in Complex I
What does Succinate donate to the ETC?
Succinate donates 2 e- and 2H+
to FAD in Complex IIA
What does L-3-P donate to the ETC?
(Glycerol-3-Phosphate)
L-3-P donates 2e- and 2H+
to FAD in Complex IIB
C!
e- donors donate e- to different sides of IMM.
What side do each donate?
NADH + Succinate → Matrix (N)
L-3-P → Intermembrane Space (P)
What is the is the e- collector from all 3 electron donors via their accepting complexes?
Q is the e- collector from all 3 electron donors via their accepting complexes?
Beyond Q all rxns. of ETC are identical for all 3 e- donors.
What’s the function of ETC?
(In 1 sentence)
To create an H+ electro-concentration gradient
across the IMM……….a way to store energy
4
The ETC transports protons from the matrix to the
intermembrane space.
This results in what two important effects?
Electron transport through the IMM leads to an electro-concentration gradient (proton motive force) across IMM.
Why is this important?
Energy of proton motive force (PMF)
drives synthesis of ATP by ATP Synthase.
