Multiple Choice
In the context of DNA structure, both DNA and RNA are polymers made of repeating building blocks called:
7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA structure, what is the backbone of DNA primarily composed of?
A
A continuous chain of nitrogenous bases linked by peptide bonds
B
Alternating deoxyribose sugars and phosphate groups
C
Alternating ribose sugars and phosphate groups
D
Alternating amino acids and phosphate groups
Verified step by step guidance1
Recall the basic structure of DNA, which consists of a long chain of nucleotides.
Each nucleotide is made up of three components: a nitrogenous base, a sugar molecule, and a phosphate group.
Understand that the backbone of DNA is formed by the sugar and phosphate groups, which alternate along the length of the DNA strand.
Note that in DNA, the sugar is deoxyribose, not ribose (which is found in RNA), and the nitrogenous bases are attached to the sugar molecules.
Recognize that the sugar and phosphate groups are connected by phosphodiester bonds, not peptide bonds, forming a continuous sugar-phosphate backbone.
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