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7 May 2018

19. Which of the following is a component of Succinate dehydrogenase in Electron transport chain?

A. Niacin

B. FMN

C. FAD

D. Coenzyme Q

E. Lipoic acid

20. In electron transport the flow of electrons:

A. is bidirectional

B. goes from a high energy state to a low energy state

C. takes place in the outer mitochondrial membrane

D. are used to pump H+ into the mitochondrial matrix

21. Which of the following statements about the electron transport chain is NOT correct

A. It is located in the inner mitochondrion membrane

B. Cytochrome c accepts electrons from complex II

C. Cytochrome c oxidase (complex IV) accepts electrons from Cytochrome c

D. Complex I is called NADH dehydrogenase

E. Coenzyme Q accepts electrons from complex I and complex II

22. In the electron transport chain, the enzyme cytochrome C oxidase:

A. Uses H2O as a substrate

B. Produces HOOH as a product

C. Cannot function if oxygen is absent

D. Accepts electrons from hydrogen ions

E. Uses ADP and Pi as substrates

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Hubert Koch
Hubert KochLv2
8 May 2018
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Related questions

15. The prosthetic group of NADH dehydrogenase:

A. FMN

B. NADH

C. FAD

D. NADPH

E. Iron

16. What type of reactions form the basis of the electron transport chain and what is the final electron acceptor?

A. Acid-base reactions; O2

B. Acid-base reactions; water

C. Oxidation-reduction reactions; water

D. Oxidation-reduction reactions; NADH

E. Oxidation-reduction reactions; O2

17. Which shows the proper order of electron transfer for the listed electron transport chain components (not all electron carriers are shown)?

A. NADH → → Q → → cytochrome c → → O2

B. O2 → → cytochrome c → → Q → → NADH

C. NADH → → cytochrome c → → Q → → O2

D. Q → → NADH → → cytochrome c → → O2

E. NADH → → O2 → → cytochrome c → → Q

18. Which complex oxidize NADH and FADH2 respectively in the electron transport chain

A. Complex I, Complex I

B. Complex I, Complex II

C. Complex II, Complex III

D. Complex II, Complex I

E. Complex II, Complex IV

Identify the electron transport complex for each of these:

a) This complex transfers electrons to molecular oxygen

b) This complex transfers electrons to a heme group in cytochrome C

c) This complex accepts electrons from reduced ubiquinone

d) This complex is not active in electron transport if the electrons were delivered by FADH2

e) This complex only transfers electrons, but does not pump protons

Can you answer the following questions:

1. Carbon monoxide is considered toxic because it acts on Complex IV. How would the addition of carbon monoxide to actively respiring mitochondria affect the relative oxidation-reduction states of all components of the electron-transport chain?

A) All four complexes would remain oxidized because they function as a multisystem complex.

B) Complexes I and III would be reduced, but complexes II and IV would be oxidized because the

electrons come from FADH2 oxidation, not NADH.

C) Complexes I, II, and III would be oxidized but Complex IV would remain reduced.

D) Complexes I, II, and III would be reduced and Complex IV would be oxidized.

E) All four complexes would remain reduced because they function as a multisystem complex.

2. Electrons are not very soluble in hydrophobic environments such as a bilipid membrane. What evidence is there that electrons move from complex to complex through the lipid membrane?

A) Cytochrome C is the electron carrier in the membrane and undergoes a head-over-heel flip to set up the proton gradient.

B) Cytochrome C is the electron carrier in the membrane and contains a cydrophoric porphyrin center.

C) CoQ is the electron carrier within the membrane and seems to be confined to the respirasome.

D) CoQ is the electron carrier within the membrane and it contains a hydrophobic porphyrin center.

E) FeS clusters are the carriers within the membrane and the electrons move from one cluster to the

next in a chain-like fashion.

3. What is the rationale for saying that “electrons flow down the electron-transport chain”?

A) Electrons flow from oxidized carriers to reduced carriers in discrete steps like a staircase.

B) Electrons flow from half-reactions with more positive redox potentials to more negative.

C) Electrons flow from reactions that continuously generate negative free energy values.

D) Electrons flow from the outer surface to the inner surface, a top down perception.

E) Because we think of electrons flowing like a liquid, the only direction electrons can flow is down.

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