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In DNA, the base adenine always pairs with:

  • A thymine
  • B guanine
  • C cytosine
  • D uracil

Correct answer: A. thymine

Explanation: Adenine pairs with thymine (A–T) in DNA.

Concept context

DNA structure, replication, transcription, translation, the genetic code, and gene regulation (lac operon). The single most important chapter for NEET molecular biology.

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