Biology CLEP Prep Practice Exam

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Prepare for the Biology CLEP Test. Study with flashcards and multiple choice questions, each question includes hints and explanations. Get ready to ace your exam!

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Which is not a subunit of a molecule of DNA?

Cytosine
Adenine
Guanine
Fructose

The correct answer is: Fructose

DNA is composed of nucleotides, which are chemically constructed of a sugar molecule, a phosphate group, and a nitrogenous base. The four nitrogenous bases found in DNA are adenine, guanine, cytosine, and thymine. Therefore, the only option that is not a component of DNA is fructose, as it is a sugar and not a nitrogenous base.