Multiple Choice
The difference between ATP and the nucleoside triphosphates used during DNA synthesis is that:
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1. Introduction to Biochemistry
Nucleic Acids
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In the context of nucleic acid metabolism, what happens to NADH when it is oxidized?
A
It is converted to FADH$_2$
B
It is converted to ATP
C
It is converted to NADP$^+$
D
It is converted to NAD$^+$
Verified step by step guidance1
Understand the role of NADH in cellular metabolism: NADH is a coenzyme that acts as an electron carrier, transferring electrons during metabolic reactions.
Recognize the process of oxidation: Oxidation involves the loss of electrons. When NADH is oxidized, it donates electrons to another molecule in the electron transport chain or other metabolic pathways.
Identify the product of NADH oxidation: When NADH loses electrons, it is converted back to its oxidized form, NAD$^+$, which can then participate in further metabolic reactions.
Clarify why the other options are incorrect: NADH is not converted to FADH$_2$, ATP, or NADP$^+$ during oxidation. FADH$_2$ is a separate electron carrier, ATP is synthesized through phosphorylation, and NADP$^+$ is involved in anabolic reactions rather than electron transport.
Conclude that the correct answer is NAD$^+$, as this is the oxidized form of NADH and aligns with its role in electron transport and metabolism.
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