Practice Quiz

IB Biology Exam Prep

Category - Biology

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Nucleic acids are composed of which of the following:
I. Nitrogenous base
II. Sugar
III. Phosphate
  1. I only
  2. II only
  3. III only
  4. I and III only
  5. I, II, and III only
Explanation
Answer: E, I, II, and III only. Nucleic acids are comprised of a nitrogenous base, a sugar, and a phosphate.

Key Takeaway: Both DNA and RNA are comprised of smaller subunits called nucleotides. Each nucleotide is composed of a nitrogenous base (purine or pyrimidine), a sugar (ribose or 2’-deoxyribose), and a phosphate group. In addition to DNA and RNA, nucleotides such as ATP and GTP are essential sources of energy.
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