Multiple Choice
Which option correctly describes Watson-Crick base pairing in double-stranded DNA?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In the structure of DNA, which pentose sugar is found in the backbone of the molecule?
A
Fructose
B
2-deoxyribose
C
Glucose
D
Ribose
Verified step by step guidance1
Recall that DNA stands for deoxyribonucleic acid, which hints at the type of sugar present in its structure.
Understand that the backbone of DNA is composed of alternating sugar and phosphate groups.
Identify that the sugar in DNA is a pentose sugar, meaning it has five carbon atoms.
Differentiate between ribose and deoxyribose: ribose has a hydroxyl group (-OH) on the 2' carbon, while deoxyribose lacks this hydroxyl group at the 2' carbon, having only a hydrogen atom instead.
Conclude that the pentose sugar found in the backbone of DNA is 2-deoxyribose, distinguishing it from ribose found in RNA.
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