FIGURE 16-6 FIGURE 16-2 FIGURE 16-7 QUESTION 1 1. For Questions #1-8, consider b
ID: 303403 • Letter: F
Question
FIGURE 16-6 FIGURE 16-2 FIGURE 16-7
QUESTION 1
1. For Questions #1-8, consider both the PDH complex (Figures 16-2 and 16-6 of Lehninger 6th ed.) and the citric acid cycle (Figure 16-7 of Lehninger 6th ed.). Each individual step is indicated within answer choices by the enzyme which catalyzes that step. For each question, select any/all answer choices that apply.
QUESTION: This step is called a dehydrogenation because the glucose-derived metabolite (substrate) gets oxidized.
A.
PDH (pyruvate dehydrogenase) complex
B.
citrate synthase
C.
alpha-ketoglutarate dehydrogenase complex
D.
succinyl-CoA synthetase
E.
succinate dehydrogenase
F.
malate dehydrogenase
QUESTION 2
1. For Questions #1-8, consider both the PDH complex (Figures 16-2 and 16-6 of Lehninger 6th ed.) and the citric acid cycle (Figure 16-7 of Lehninger 6th ed.). Each individual step is indicated within answer choices by the enzyme which catalyzes that step. For each question, select any/all answer choices that apply.
QUESTION: This step involves a three-enzyme complex that engages in "substrate-channeling".
A.
PDH (pyruvate dehydrogenase) complex
B.
citrate synthase
C.
alpha-ketoglutarate dehydrogenase complex
D.
succinyl-CoA synthetase
E.
succinate dehydrogenase
F.
malate dehydrogenase
QUESTION 3
1. For Questions #1-8, consider both the PDH complex (Figures 16-2 and 16-6 of Lehninger 6th ed.) and the citric acid cycle (Figure 16-7 of Lehninger 6th ed.). Each individual step is indicated within answer choices by the enzyme which catalyzes that step. For each question, select any/all answer choices that apply.
QUESTION: This step is tightly regulated in a cellular context.
A.
PDH (pyruvate dehydrogenase) complex
B.
citrate synthase
C.
alpha-ketoglutarate dehydrogenase complex
D.
succinyl-CoA synthetase
E.
succinate dehydrogenase
F.
malate dehydrogenase
QUESTION 4
1. For Questions #1-8, consider both the PDH complex (Figures 16-2 and 16-6 of Lehninger 6th ed.) and the citric acid cycle (Figure 16-7 of Lehninger 6th ed.). Each individual step is indicated within answer choices by the enzyme which catalyzes that step. For each question, select any/all answer choices that apply.
QUESTION: This step represents a substrate-level phosphorylation.
A.
PDH (pyruvate dehydrogenase) complex
B.
citrate synthase
C.
alpha-ketoglutarate dehydrogenase complex
D.
succinyl-CoA synthetase
E.
succinate dehydrogenase
F.
malate dehydrogenase
QUESTION 5
1. For Questions #1-8, consider both the PDH complex (Figures 16-2 and 16-6 of Lehninger 6th ed.) and the citric acid cycle (Figure 16-7 of Lehninger 6th ed.). Each individual step is indicated within answer choices by the enzyme which catalyzes that step. For each question, select any/all answer choices that apply.
QUESTION: This step represents an energy-harnessing reaction, in the sense that universal reducing equivalents are generated during this step.
A.
PDH (pyruvate dehydrogenase) complex
B.
citrate synthase
C.
alpha-ketoglutarate dehydrogenase complex
D.
succinyl-CoA synthetase
E.
succinate dehydrogenase
F.
malate dehydrogenase
QUESTION 6
1. For Questions #1-8, consider both the PDH complex (Figures 16-2 and 16-6 of Lehninger 6th ed.) and the citric acid cycle (Figure 16-7 of Lehninger 6th ed.). Each individual step is indicated within answer choices by the enzyme which catalyzes that step. For each question, select any/all answer choices that apply.
QUESTION: Under standard biochemical conditions, this step is close to equilibrium and therefore readily reversible.
A.
PDH (pyruvate dehydrogenase) complex
B.
citrate synthase
C.
alpha-ketoglutarate dehydrogenase complex
D.
succinyl-CoA synthetase
E.
succinate dehydrogenase
F.
malate dehydrogenase
QUESTION 7
1. For Questions #1-8, consider both the PDH complex (Figures 16-2 and 16-6 of Lehninger 6th ed.) and the citric acid cycle (Figure 16-7 of Lehninger 6th ed.). Each individual step is indicated within answer choices by the enzyme which catalyzes that step. For each question, select any/all answer choices that apply.
QUESTION: This step generates the reduced form of FAD.
A.
PDH (pyruvate dehydrogenase) complex
B.
citrate synthase
C.
alpha-ketoglutarate dehydrogenase complex
D.
succinyl-CoA synthetase
E.
succinate dehydrogenase
F.
malate dehydrogenase
QUESTION 8
1. For Questions #1-8, consider both the PDH complex (Figures 16-2 and 16-6 of Lehninger 6th ed.) and the citric acid cycle (Figure 16-7 of Lehninger 6th ed.). Each individual step is indicated within answer choices by the enzyme which catalyzes that step. For each question, select any/all answer choices that apply.
QUESTION: This step represents a redox reaction.
A.
PDH (pyruvate dehydrogenase) complex
B.
citrate synthase
C.
alpha-ketoglutarate dehydrogenase complex
D.
succinyl-CoA synthetase
E.
succinate dehydrogenase
F.
malate dehydrogenase
A.
PDH (pyruvate dehydrogenase) complex
B.
citrate synthase
C.
alpha-ketoglutarate dehydrogenase complex
D.
succinyl-CoA synthetase
E.
succinate dehydrogenase
F.
malate dehydrogenase
Explanation / Answer
1. Succinate dehydrogenase is enzyme catalyzes reaction where succinate is oxidized to fumarate. This process is a dehydrogenation.
2. PDH complex is a multi subunit complex which is invloved in substrate channeling.
3. Conversion of pyruvate to acetyl-CoA step catalysed by PDH complex is tightly regulated.
4. Conversion of succinyl CoA to succinate is where the substrate level phosphorylation of GDP happens catalysed by succinyl CoA synthetase.
5. Universal reducing equivalents in the form of FADH2 are generated during the conversion of succinate to fumarate catalysed by succinate dehydrogenase.
6. The reaction in which malate is converted to oxaloacetate by malate dehydrogenase is reversible, in fact favors malate.
7. Succinate dehydrogenase produces reduced form of FAD in the citric acid cycle.
8. The redox step is the conversion of pyruvate to acetyl CoA catalysed by PDH complex.
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