Multiple Choice
In the B-form DNA double helix, approximately how many times longer is one helical turn than the diameter (width) of the helix?
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7. DNA and Chromosome Structure
DNA Structure
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In the DNA double helix, what chemical components make up the “sides” (backbone) of the molecule?
A
A continuous chain of amino acids linked by peptide bonds
B
Alternating deoxyribose sugars and phosphate groups (a sugar-phosphate backbone)
C
Alternating ribose sugars and phosphate groups (a ribose-phosphate backbone)
D
Alternating nitrogenous bases paired by hydrogen bonds
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