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What is the role of N A D + NAD^+ N A D + in cellular respiration?
easy
Respiration in Plants
2018
biology
It is a nucleotide source for ATP synthesis.
It functions as an electron carrier.
It functions as an enzyme.
It is the final electron acceptor for anaerobic respiration.
Explanation To solve this problem, we need to understand the role of N A D + NAD^+ N A D + in cellular respiration. Let's analyze each option: ∙ \newline \bullet ∙ Option 1: It is a nucleotide source for ATP synthesis. \newline - N A D + NAD^+ N A D +
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is not directly used as a nucleotide source for ATP synthesis. ATP synthesis involves ADP and inorganic phosphate.
- Therefore, this option is incorrect.
Option 2: It functions as an electron carrier.
-
is a coenzyme that functions as an electron carrier in cellular respiration.
- It accepts electrons during glycolysis and the citric acid cycle, becoming
N A D H . NADH. \newline N A DH . -
then donates these electrons to the electron transport chain, facilitating ATP production.
- Therefore, this option is correct.
Option 3: It functions as an enzyme.
-
is not an enzyme; it is a coenzyme that assists enzymes by carrying electrons.
- Therefore, this option is incorrect.
Option 4: It is the final electron acceptor for anaerobic respiration.
- In anaerobic respiration, the final electron acceptor is not
but rather other molecules like sulfate or nitrate, depending on the organism.
- Therefore, this option is incorrect.
Based on the analysis, the correct role of
in cellular respiration is as an electron carrier.
Thus, the correct option is Option 2.