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SAT Biology Subject Test Practice Questions

Category - Biology

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RNA is composed of all of the following bases EXCEPT:

Adenine
Guanine
Cytosine
Thymine
Uracil

Explanation

Answer: D, Thymine. Thymine is used as a nitrogenous base in DNA, but not RNA.

Key Takeaway: Both DNA and RNA use adenine, guanine, and cytosine as bases. However, DNA uses thymine as its fourth base, and RNA uses uracil as its fourth base.

Photo: T7 RNA Polymerase, Tim Vickers

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