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A nucleic acid molecule is made up of a pentose sugar, a nitrogenous base, and a phosphate group. Which of the following statements is correct?

1. A nucleic acid is composed of a pentose sugar, a nitrogen-containing base, and a phosphate group.
2. DNA contains the sugar D (-)-2-deoxy ribose.
3. RNA contains the sugar D (-)-ribose.
4. None of these statements are correct.

Correct answer: A nucleic acid is composed of a pentose sugar, a nitrogen-containing base, and a phosphate group.

Solution

Option A is correct because it accurately describes the composition of nucleic acids, which include a pentose sugar, a heterocyclic base, and phosphoric acid.

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