Which stage(s) of cellular respiration directly involve $\text{NAD}^+$ as an electron acceptor?

## CORE INFORMATION\n✓ **Answer**: D\n## CONCEPT FRAMEWORK\n **Primary Concept**: NAD+ Function in Cellular Respiration Stages\n **Related Topics**: Glycolysis, Pyruvate Oxidation, Krebs Cycle\n **Prerequisites**: Knowledge of the steps involved in cellular respiration.\n## SOLUTION PATHWAY\n**Given Information**:\n The question asks which stages of cellular respiration directly involve NAD+ as an electron acceptor.\n**Method & Steps**:\n 1. Review the steps of cellular respiration.\n Reasoning: Glycolysis, pyruvate oxidation, and the Krebs cycle all involve oxidation reactions where NAD+ is reduced to NADH.\n 2. Identify the stages where NAD+ acts as an electron acceptor.\n Working: In glycolysis, glyceraldehyde-3-phosphate is oxidized, and NAD+ accepts electrons to form NADH. In pyruvate oxidation, pyruvate is oxidized to acetyl-CoA, and NAD+ is reduced. In the Krebs cycle, several oxidation steps involve the reduction of NAD+ to NADH.\n Key Point: The electron transport chain uses NADH, but NAD+ isn't directly involved as an acceptor in that stage.\n 3. Select the correct answer.\n Result: D. Glycolysis, Krebs cycle, and Pyruvate Oxidation\n Verification: All three stages mentioned use NAD+ as an electron acceptor during oxidation reactions.\n ## OPTION ANALYSIS\nA :x: NAD+ is involved in more than just glycolysis.\nB :x: NAD+ is also involved in glycolysis and pyruvate oxidation.\nC :x: The electron transport chain uses NADH, not NAD+ as an electron acceptor.\nD ✓: NAD+ functions as an electron acceptor in all three stages: glycolysis, pyruvate oxidation, and the Krebs cycle.\n ## LEARNING AIDS\n **Common Mistakes**:\n 1.Focusing only on one stage: NAD+ plays a vital role in multiple stages of cellular respiration.\n How to avoid: Review each stage carefully for NAD+ involvement.\n 2.Confusing NADH with NAD+: Understand the difference between the oxidized (NAD+) and reduced (NADH) forms.\n How to avoid: Remember that NAD+ accepts electrons and becomes NADH.\n **Quick Tips**:\n 1.Glycolysis, pyruvate oxidation, and Krebs cycle all involve NAD+ as an electron acceptor.\n 2.NAD+ is reduced to NADH in these stages.

The correct Option is "Glycolysis, Krebs cycle, and Pyruvate Oxidation"

NEET Botany Respiration in Plants MCQs

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