Exam 19: Oxidative Phosphorylation and Photophosphorylation

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:

Mutations in mitochondrial genes play a role in each of the following diseases except:

Which of the following is not found in modern cyanobacteria?

Which of the following is correct concerning the mitochondrial ATP synthase?

For each of the following explain whether they are transported into or out of the mitochondrion and comment briefly on the mechanism for each: (1)NADH (2)Inorganic phosphate (3)ADP

Oxidative phosphorylation and photophosphorylation share all of the following except:

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:

Discuss three lines of evidence that support the theory that mitochondria evolved from endosymbiontic bacteria.

Although molecular oxygen (O₂)does not participate directly in any of the reactions of the citric acid cycle,the cycle operates only when O₂ is present.Explain this observation.

The standard reduction potential for ubiquinone (Q or coenzyme Q)is 0.045 V,and the standard reduction potential (E'°)for FAD is -0.219 V.Using these values,show that the oxidation of FADH₂ by ubiquinone theoretically liberates enough energy to drive the synthesis of ATP.The Faraday constant,,is 96.48 kJ/V·mol. $\Delta$ G'° for ATP synthesis is +30.5 kJ/mol.

During electron transfer through the mitochondrial respiratory chain,the overall reaction is: NADH + 1/2 O₂ + H⁺ $\rightarrow$ NAD⁺ + H₂O.The difference in reduction potentials for the two half-reactions ( $\Delta$ E'°)is +1.14 V.Show how you would calculate the standard free-energy change, $\Delta$ G'°,for the reaction as written above.(The Faraday constant,,is 96.48 kJ/V·mol. )

Which one of the following is true about reaction centers?

Describe and explain the two different ratios that affect the rate of respiration in mitochondria.What is accomplished by these control mechanisms?

The skunk cabbage (Symphocarpus foetidus)can maintain a temperature of 10-25 °C higher than the temperature of the surrounding air.Suggest a mechanism for this.

Place the following electron-carriers into the proper order as found in plant chloroplasts. 1)Cytochrome b₆f complex 2)P680 3)P700 4)Plastocyanin 5)NADPH

Which of the following statements about the light reactions in photosynthetic plants is false?

Which of the following is not controlled by hypoxia-inducible factor (HIF-1)?

The rate of oxidative phosphorylation in mitochondria is controlled primarily by:

Which of the following electron carriers is not able to transfer one electron at a time?

During photophosphorylation in plants,electrons flow through a series of carriers in the chloroplast.What is the ultimate donor of electrons,and what is the ultimate acceptor? What provides the energy to move those electrons?