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In DNA, the base guanine always pairs with:

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

Correct answer: A. cytosine

Explanation: Guanine pairs with cytosine (G–C).

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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