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In DNA, there are

  • A.five bases known as adenine, guanine, thymine, tryptophan and cytosine
  • B.four bases known as adenine, guanine, thymine and cytosine
  • C.three bases known as adenine, guanine and cytosine
  • D.only two bases known as adenine and cytosine

Answer: B

Correct answer: four bases known as adenine, guanine, thymine and cytosine

DNA uses four bases: the purines adenine and guanine, and the pyrimidines thymine and cytosine. RNA replaces thymine with uracil. Tryptophan is an amino acid, not a base.

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