Chapter 19

33 Questions  I  By KaliCox

  
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1.  Which one of the following best describes the role of mitochondria in apoptosis?
A.
B.
C.
D.
E.
2.  Which of the following statements about the chemiosmotic theory is correct?
A.
B.
C.
D.
E.
3.  The light reactions in photosynthetic higher plants:
A.
B.
C.
D.
E.
4.  In photophosphorylation, absorption of light energy in chloroplast “light reactions” leads to:
A.
B.
C.
D.
E.
5.  A new compound isolated from mitochondria is claimed to represent a previously unrecognized carrier in the electron transfer chain. It is given the name coenzyme Z. Which line of evidence do you feel is the least conclusive in assigning this compound a position in the electron transfer chain?
A.
B.
C.
D.
E.
6.  If electron transfer in tightly coupled mitochondria is blocked (with antimycin A) between cytochrome b and cytochrome c1, then:
A.
B.
C.
D.
E.
7.  Which one of the following is true about reaction centers?
A.
B.
C.
D.
E.
8.  Cyclic electron flow in chloroplasts produces:
A.
B.
C.
D.
E.
9.  In the reoxidation of QH2 by purified ubiquinone-cytochrome c reductase (Complex III) from heart muscle, the overall stoichiometry of the reaction requires 2 mol of cytochrome c per mole of QH2 because:
A.
B.
C.
D.
E.
10.  In what order do the following five steps occur in the photochemical reaction centers? 1) Excitation of the chlorophyll a molecule at the reaction center 2) Replacement of the electron in the reaction center chlorophyll 3) Light excitation of antenna chlorophyll molecule 4) Passage of excited electron to electron-transfer chain 5) Exiton transfer to neighboring chlorophyll
A.
B.
C.
D.
E.
11.  Uncoupling of mitochondrial oxidative phosphorylation:
A.
B.
C.
D.
E.
12.  Photosynthetic phosphorylation and oxidative phosphorylation appear to be generally similar processes, both consisting of ATP synthesis coupled to the transfer of electrons along an electron carrier chain. Which of the following is not true of both processes?
A.
B.
C.
D.
E.
13.  Which one of the following statements about photophosphorylation is false?
A.
B.
C.
D.
E.
14.  Cyanide, oligomycin, and 2,4-dinitrophenol (DNP) are inhibitors of mitochondrial aerobic phosphorylation. Which of the following statements correctly describes the mode of action of the three inhibitors?
A.
B.
C.
D.
E.
15.  In the photolytic cleavage of water by the oxygen-evolving complex [2H2O → 4 H+ + 4e– + O2], how many photons of light at a wavelength of 680 nm are required?
A.
B.
C.
D.
E.
16.  The rate of oxidative phosphorylation in mitochondria is controlled primarily by:
A.
B.
C.
D.
E.
17.  Mutations in mitochondrial genes play a role in each of the following diseases except:
A.
B.
C.
D.
E.
18.  Which one of the following statements about human mitochondria is true?
A.
B.
C.
D.
E.
19.  During oxidative phosphorylation, the proton motive force that is generated by electron transport is used to:
A.
B.
C.
D.
E.
20.  2,4-Dinitrophenol and oligomycin inhibit mitochondrial oxidative phosphorylation. 2,4- Dinitrophenol is an uncoupling agent; oligomycin blocks the ATP synthesis reaction itself. Therefore, 2,4-dinitrophenol will:
A.
B.
C.
D.
E.
21.  The relative concentrations of ATP and ADP control the cellular rates of:
A.
B.
C.
D.
E.
22.  The experimental determination of the effectiveness of light of different colors in promoting photosynthesis is called the:
A.
B.
C.
D.
E.
23.  Which of the following is correct concerning the mitochondrial ATP synthase?
A.
B.
C.
D.
E.
24.  Upon the addition of 2,4-dinitrophenol (DNP) to a suspension of mitochondria carrying out oxidative phosphorylation linked to the oxidation of malate, all of the following occur except:
A.
B.
C.
D.
E.
25.  Which of the following statements about the light reactions in photosynthetic plants is false?
A.
B.
C.
D.
E.
26.  Oxidative phosphorylation and photophosphorylation share all of the following except:
A.
B.
C.
D.
E.
27.  Almost all of the oxygen (O2) one consumes in breathing is converted to:
A.
B.
C.
D.
E.
28.  Antimycin A blocks electron transfer between cytochromes b and c1. If intact mitochondria were incubated with antimycin A, excess NADH, and an adequate supply of O2, which of the following would be found in the oxidized state?
A.
B.
C.
D.
E.
29.  Which of the following statements about energy conservation in the mitochondrion is false?
A.
B.
C.
D.
E.
30.  In normal mitochondria, the rate of NADH consumption (oxidation) will:
A.
B.
C.
D.
E.
31.  Which of the following statements about the chemiosmotic theory is false?
A.
B.
C.
D.
E.
32.  The oxidation of a particular hydroxy substrate to a keto product by mitochondria has a P/O ratio of less than 2. The initial oxidation step is very likely directly coupled to the:
A.
B.
C.
D.
E.
33.  When the ΔG'° of the ATP synthesis reaction is measured on the surface of the ATP synthase enzyme, it is found to be close to zero. This is thought to be due to:
A.
B.
C.
D.
E.
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