One molecule of ATP is composed of

  • A. adenine, ribose and three phosphate groups
  • B. adenine, deoxyribose and three phosphate groups
  • C. guanine, ribose and two phosphate groups
  • D. adenine, glucose and three phosphate groups

Explanation

ATP is a nucleotide: the base adenine joined to the sugar ribose and a chain of three phosphates. The sugar is ribose rather than deoxyribose, which is why ATP belongs to the RNA family of nucleotides.

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