Biology CLEP Prep Practice Exam

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Are you gearing up for the Biology CLEP exam? Prepare like a pro with our Biology CLEP Prep Practice Exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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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.