Which base always pairs with Adenine in double-stranded DNA?

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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 base always pairs with Adenine in double-stranded DNA?

Explanation:
DNA uses complementary base pairing to keep the two strands uniform in width. Adenine pairs with thymine through two hydrogen bonds, forming the A–T pair. This purine–pyrimidine pairing helps maintain a consistent helix structure and supports faithful replication. Uracil is used in RNA and pairs with adenine there, not in DNA. Cytosine pairs with guanine via three hydrogen bonds. So, the base that always pairs with adenine in double-stranded DNA is thymine.

DNA uses complementary base pairing to keep the two strands uniform in width. Adenine pairs with thymine through two hydrogen bonds, forming the A–T pair. This purine–pyrimidine pairing helps maintain a consistent helix structure and supports faithful replication. Uracil is used in RNA and pairs with adenine there, not in DNA. Cytosine pairs with guanine via three hydrogen bonds. So, the base that always pairs with adenine in double-stranded DNA is thymine.

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