Nucleic Acids Have a Definite Polarity, or Directionality

question 5

Multiple Choice

Nucleic acids have a definite polarity, or directionality. Stated another way, one end of the molecule is different from the other end. How are these ends described?

• A) One end has an unlinked 3 carbon; the other end has an unlinked 5 carbon.
• B) One end has one phosphate group; the other end has two phosphate groups.
• C) One end contains a nitrogenous base; the other end lacks it.
• D) One end has a hydroxyl group on the 2 carbon; the other end has a hydrogen atom on the 2 carbon.

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