Concept explainers
REFLECT AND APPLY The following half reactions play important roles in
Which of these two is a half reaction of oxidation? Which one is a half reaction of reduction? Write the equation for the overall re- action. Which reagent is the oxidizing agent (electron acceptor)? Which reagent is the reducing agent (electron donor)?
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BIOCHEMISTRY (LOOSELEAF) >CUSTOM PKG<
- REFLECT AND APPLY There is a reaction in carbohydrate meta- bolism in which glucose-6-phosphate reacts with NADP+ to give 6-phosphoglucono- -lactone and NADPH. In this reaction, which substance is oxidized, and which is reduced? Which substance is the oxidizing agent, and which is the reducing agent?arrow_forwardREFLECT AND APPLY Show how the reactions of the electron transport chain differ from those in Question 3 when FADH2 is the starting point for electron transport. Show how the reactions that liberate enough energy to drive the phosphorylation of ADP differ from the pathway when NADH is the starting point.arrow_forwardREFLECT AND APPLY The malate-aspartate shuttle yields about 2.5 moles of ATP for each mole of cytosolic NADH. Why does nature use the glycerol-phosphate shuttle, which yields only about 1.5 moles of ATP?arrow_forward
- REFLECT AND APPLY What is the relationship between a transition-state analog and the induced-fit model of enzyme kinetics?arrow_forwardREFLECT AND APPLY Does the net gain of ATP in glycolysis differ when glycogen, rather than glucose, is the starting material? If so, what is the change?arrow_forwardREFLECT AND APPLY Why is it useful to plot rate data for enzymatic reactions as a straight line rather than as a curve?arrow_forward
- REFLECT AND APPLY There is a reaction in which succinate reacts with FAD to give fumarate and FADH2. In this reaction, which substance is oxidized, and which is reduced? Which substance is the oxidizing agent, and which is the reducing agent?arrow_forwardREFLECT AND APPLY Why can we say that having a pure non- competitive inhibitor present is similar to just having less enzyme present?arrow_forwardREFLECT AND APPLY Noncompetitive inhibition is a limiting case in which the effect of binding inhibitor has no effect on the affinity for the substrate and vice versa. Suggest what a LineweaverBurk plot would look like for an inhibitor that had a reaction scheme similar to that on page 159 (noncompetitive inhibition reaction), but where binding inhibitor lowered the affinity of EI for the substrate.arrow_forward
- BiochemistryBiochemistryISBN:9781305961135Author:Mary K. Campbell, Shawn O. Farrell, Owen M. McDougalPublisher:Cengage Learning