Multiple Choice
Which of the following components is NOT found in DNA?
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 ribose sugars and phosphate groups
C
Alternating deoxyribose sugars and phosphate groups
D
Alternating nitrogenous bases and phosphate groups
Verified step by step guidance1
Recall the basic structure of DNA, which consists of a long chain of nucleotides.
Understand that each nucleotide is composed of three parts: a phosphate group, a sugar molecule, and a nitrogenous base.
Identify that the sugar in DNA is deoxyribose, not ribose (which is found in RNA).
Recognize that the sugar-phosphate backbone is formed by the alternating connection of phosphate groups and deoxyribose sugars.
Note that nitrogenous bases are attached to the sugar molecules and do not form part of the backbone itself.
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