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31 Oct 2018

1. Which of the following are not components of the respiratory chain complexes?

A.) Cytochrome a3

B.) An Fe-S cluster protein

C.) Cytochrome b

D.) Coenzyme Q

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Related questions

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

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

Determine which of these statements describing the cytochrome P450 family of enzymes or the mechanism of action are true.

a) The iron in cytochrome P450s can exist in both Fe2 and Fe3 states in a single catalytic cycle.

b) The coenzyme NADPH can serve as a source of electrons for cytochrome P450s.

c) Fe3 acts as a general base during the catalytic cycle.

d) Each cytochrome P450 isoform can act on only one specific organic substrate.

e) Cytochrome P450 uses molecular oxygen (O2) as a reactant.

f) The activity of cytochrome P450 generally results in carboxylated products.

Please include an explanation with your answer! Thank you.

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