Uracil in RNA is the functional analog of which DNA base?

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Study for the Biochemistry Module 6 Exam. Study with flashcards and multiple choice questions; each question includes hints and explanations. Gear up to ace your test!

Multiple Choice

Uracil in RNA is the functional analog of which DNA base?

Explanation:
Uracil in RNA performs the same pairing role as thymine in DNA. Both bases pair with adenine, enabling the correct complementary pairing that underpins genetic information. The pairing is the same in substance—adenine forms two hydrogen bonds with its partner—so uracil can replace thymine in RNA without changing the essential base-pairing logic. The small chemical difference is that thymine has an extra methyl group that uracil lacks, making thymine more characteristic of DNA and helping distinguish DNA from RNA. That's why uracil is the functional analog of thymine.

Uracil in RNA performs the same pairing role as thymine in DNA. Both bases pair with adenine, enabling the correct complementary pairing that underpins genetic information. The pairing is the same in substance—adenine forms two hydrogen bonds with its partner—so uracil can replace thymine in RNA without changing the essential base-pairing logic. The small chemical difference is that thymine has an extra methyl group that uracil lacks, making thymine more characteristic of DNA and helping distinguish DNA from RNA. That's why uracil is the functional analog of thymine.

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