Multiple Choice
In the DNA double helix, what holds the two antiparallel strands together?
7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In the structure of DNA, what molecules form the sugar-phosphate backbone of each strand?
A
Alternating ribose sugars and phosphate groups
B
Alternating nitrogenous bases and phosphate groups
C
Alternating deoxyribose sugars and phosphate groups
D
Alternating deoxyribose sugars and nitrogenous bases
Verified step by step guidance1
Recall the basic structure of a DNA strand, which consists of a backbone and attached bases.
Understand that the backbone of DNA is made up of repeating units that alternate between sugar molecules and phosphate groups.
Identify the specific sugar in DNA as deoxyribose, which differs from ribose found in RNA by lacking one oxygen atom.
Recognize that nitrogenous bases (adenine, thymine, cytosine, guanine) are attached to the sugar molecules but are not part of the backbone itself.
Conclude that the sugar-phosphate backbone of each DNA strand is formed by alternating deoxyribose sugars and phosphate groups.
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