Discussion
In addition to serving as the building blocks for nucleic acid, nucleotides have many functions. Which of the following is not a function of a nucleotide ?
Answer: D
Providing electrons to the ETC is not a function of a nucleotide in itself.
The standard textbook account (Lehninger) gives nucleotides three roles beyond building nucleic acids: carriers of chemical energy (ATP, GTP), components of enzyme cofactors (NAD, FAD and coenzyme A contain adenosine), and chemical messengers (cAMP, cGMP as second messengers).
Electrons reach the electron transport chain from the reduced coenzymes NADH and FADH2, whose nucleotide portion is covered by the coenzyme role; donating electrons is not listed as a function of nucleotides as such. So the first three options are genuine functions, and the fourth is the exception.
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