27. The net products of the entire Q cycle are: A. QH2. 2 H\'p pumped to the N-s

Question

27. The net products of the entire Q cycle are: A. QH2. 2 H'p pumped to the N-side, & 2 oxidized cytochrome c B. Q, 4 C. D. QH2. 4H' pumped to N-side, & 2 reduced cytochromec ON H pumped to the P-side,62reduced cytochrome c OHa,4Hpumped to N-side, &1 reduced cytochrome o 28. In the binding-change model of ATP synthase: A. The proton B. There are motive force causes the F, aß subunits to rapidly rotate three aß pairs. s. At any given time, one binds ATP, one binds ADP and P and the other is empty C. The y subunit binds ADP and delivers it to each aß pair as it turns D 10 H are needed for each complete rotation of the ATP synthase. E. The y subunit binds H" 29. Which of the following statements about ATP synthesis is incorrech? A. ATP/ADP exchange across the inner mitochondrial membrane is facilitated by an antiporter that moves them with their electrochemical gradients. B. Phosphate must enter the matrix by coupling to H' movement through a symporter. C. ATP synthase activity is tightly regulated by the availability of ADP D. The F, subunit is primarily located in the membrane. 30. During oxidative phosphorylation, the proton motive force that is generated by electron transport is used to: A. generate the substrates (ADP and P) for the ATP synthase. B. induce a conformational change in the ATP synthase. C. oxidize NADH to NAD D. reduce O, to H,O.

Explanation / Answer

27.Correct answer is: B. Q,4H+ pumped to the P side and 2 reduced cytochrome C.

Reason:The final products of the Q cycle are 4 protons that enter the P side of mitochondria( the intermembrane space) two protons being taken up from the matrix 2 reduced cytochrome c being formed.

28.Correct answer is: A.The proton motive force causes the F1alpha beta subunits to rapidly rotate.

Reason:The F0F1 ATP synthase is known to function as rotary motor in which the subunit rotation is caused by current of protons that flow through F0 and drives the binding changes in F1 which is required for net ATP synthesis.

29.Correct answer is:D.The F1 subunit is primarily located in the membrane.

Reason:F1 subunit is primarily located in the matrix.

29.Correct answer is :B.induces a conformational change in the ATP synthase.

Reason.Conformational changes in ATP synthase is driven by proton motive force that directs synthesis of ATP.

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