Multiple Choice
In the DNA double helix, what type of bond holds each individual DNA strand together along its sugar-phosphate backbone?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA structure, the pentose sugar found in DNA is which of the following?
A
2-deoxyribose
B
Ribose
C
Glucose
D
Fructose
Verified step by step guidance1
Understand that DNA (deoxyribonucleic acid) is composed of nucleotides, each containing a phosphate group, a nitrogenous base, and a pentose sugar.
Recall that the pentose sugar in DNA differs from that in RNA; DNA contains a sugar missing one oxygen atom compared to RNA's sugar.
Identify that the sugar in DNA is called 2-deoxyribose, which means it is a ribose sugar lacking an oxygen atom at the 2' carbon position.
Recognize that ribose is the sugar found in RNA, while glucose and fructose are hexose sugars involved in energy metabolism, not nucleic acid structure.
Conclude that the pentose sugar in DNA is 2-deoxyribose, distinguishing DNA structurally from RNA and other sugars.
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