Multiple Choice
In the context of DNA structure, what type of biomolecule are DNA and RNA?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA structure, which molecules form the sugar-phosphate backbone of DNA?
A
Alternating deoxyribose sugars and nitrogenous bases
B
Alternating nitrogenous bases and phosphate groups
C
Alternating deoxyribose sugars and phosphate groups
D
Alternating ribose sugars 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 composed of three parts: a phosphate group, a sugar molecule, and a nitrogenous base.
Understand that the sugar in DNA is deoxyribose, not ribose (which is found in RNA).
The sugar-phosphate backbone is formed by the covalent bonds between the phosphate group of one nucleotide and the deoxyribose sugar of the next nucleotide, creating an alternating pattern.
Recognize that the nitrogenous bases are attached to the sugar molecules and extend inward, pairing with complementary bases on the opposite strand, but they do not form part of the backbone.
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