Nucleic Acids: Types and Properties · Zoology

The backbone of a nucleic acid strand consists of alternating:

Alternating sugar and base units
Alternating base and phosphate units
Alternating sugar and phosphate units
Consecutive base and base stacking only

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Correct answer: Alternating sugar and phosphate units

The structural backbone of a nucleic acid strand consists of alternating sugar (deoxyribose in DNA, ribose in RNA) and phosphate groups linked by phosphodiester bonds. The nitrogenous bases are attached to the sugars and project inward (in the double helix) or outward from this backbone.

Difficulty: Medium Question 3 of 18

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The backbone of a nucleic acid strand consists of alternating:

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