5
QuizMultiple Choice

Proteins and Nucleic Acids

Question 5 • PA Human Anatomy & Physiology A 2026-2027 SMITH IC

DNA and RNA share a number of similarities, but they also differ in certain aspects of their structure. Which nitrogenous base is found in RNA but is not found in DNA?

Answer
A
uracil
B
adenine
C
thymine
D
cytosine

Explanation

RNA uses uracil in place of thymine, which is found in DNA. Adenine and cytosine are found in both DNA and RNA. Therefore, uracil is the base found in RNA but not DNA.

AI-written and checked against the verified answer.

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