Regarding the Sugar Residues in Nucleic Acids, Which, If Any

question 15

Multiple Choice

Regarding the sugar residues in nucleic acids, which, if any, of the following statements is incorrect?

• A) The sugar is always based on a heterocyclic ring that consists of one oxygen atom and four carbon atoms, one of which is connected to a fifth carbon atom, the 5' carbon atom.
• B) The internal sugar residues in a DNA strand normally have free hydroxyl groups, unlike those in an RNA strand.
• C) Bases are covalently linked to the carbon 1' atoms of the sugars.
• D) Neighboring sugar residues are linked to each other by a phosphodiester bond that connects the 3' carbon atom on one sugar to the 5' carbon atom of its neighbour.

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