Feedback for Multiple Choice Quiz 27

  1. In some cell types, e.g. muscle, the glycolytic enzymes are localized near glycogen granules, but they are always cytosolic.

  2. Two ATP are used to prime the system, four are produced after the aldolase step, giving a net yield of 2.

  3. ATP is a high energy compound. Both NAD+ and ADP represent low energy forms. A concentration gradient is established during oxidative phosphorylation, not directly during glycolysis.

  4. The ATP/ADP control can be viewed as a special case of feedback inhibition of a pathway: ATP is the important product of glycolysis. If [ATP] is high, less carbon is sent through the pathway by inhibiting PFK; the converse is true of ADP.

  5. All three controls are done at the PFK (phosphofructokinase) step.

  6. The reaction is conversion of a alkene to an alcohol, but it is not a redox reaction.

  7. Glyceradlehyde-3-P dehydrogenase is the main energy producing step. The oxidation of the aldehyde to the acid produces NADH directly, and sets up the next reaction for phosphorylation of ADP.

  8. Since the reaction is not at equilibrium it will proceed towards equilibrium. In this case the concentration of the reactants are too high, so the reaction will spontaneously flow in the forward direction, making more product. Under these conditions, the Gibbs free energy would be negative.
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