Which nitrogen base is found in DNA but not in RNA?

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Study for the Genetics and Molecular Biology Exam. Study using flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

Multiple Choice

Which nitrogen base is found in DNA but not in RNA?

Explanation:
The thing being tested is the difference in nitrogenous bases between DNA and RNA. DNA uses thymine, while RNA uses uracil in place of thymine. Because thymine is present in DNA but not in RNA, thymine is the base found in DNA but not in RNA. Uracil serves the role that thymine would in RNA, and thymine’s extra methyl group distinguishes it chemically as a deoxyribose-based base. So the correct base is thymine.

The thing being tested is the difference in nitrogenous bases between DNA and RNA. DNA uses thymine, while RNA uses uracil in place of thymine. Because thymine is present in DNA but not in RNA, thymine is the base found in DNA but not in RNA. Uracil serves the role that thymine would in RNA, and thymine’s extra methyl group distinguishes it chemically as a deoxyribose-based base. So the correct base is thymine.

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