Multiple Choice
Where is the glycogen used for anaerobic exercise primarily stored in the body?
3. Energy & Cell Processes
Fermentation & Anaerobic Respiration
Multiple Choice
Which of the following statements about NAD+ is true?
A
NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the Krebs cycle.
B
NAD+ has more chemical energy than NADH.
C
NAD+ donates high energy electrons to the electron transport chain.
D
In the absence of NAD+, glycolysis can still function.
Verified step by step guidance1
Understand the role of NAD+ in cellular respiration: NAD+ is a coenzyme that functions as an electron carrier. It is crucial in the process of transferring electrons during metabolic reactions.
Identify the process of reduction: In biochemical terms, reduction refers to the gain of electrons. NAD+ is reduced to NADH by gaining electrons during glycolysis, pyruvate oxidation, and the Krebs cycle.
Compare the energy states: NADH is the reduced form of NAD+ and carries more energy because it has gained electrons. Therefore, NAD+ has less chemical energy compared to NADH.
Examine the role of NAD+ in the electron transport chain: NADH, not NAD+, donates high-energy electrons to the electron transport chain, which is essential for ATP production.
Consider the necessity of NAD+ for glycolysis: NAD+ is essential for glycolysis to proceed because it accepts electrons during the conversion of glucose to pyruvate. Without NAD+, glycolysis cannot continue efficiently.
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