Multiple Choice
In double-stranded DNA, guanine always forms hydrogen bonds with which base?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In the DNA double helix, what are the “sides” of the ladder (the sugar-phosphate backbone) made of?
A
Amino acids linked by peptide bonds
B
Alternating ribose sugars and phosphate groups
C
Alternating deoxyribose sugars and phosphate groups
D
Paired nitrogenous bases held together by hydrogen bonds
Verified step by step guidance1
Understand the structure of the DNA double helix, which resembles a twisted ladder.
Identify that the "sides" of the ladder refer to the backbone of the DNA molecule.
Recall that the backbone is composed of repeating units of sugar and phosphate groups linked together.
Note that in DNA, the sugar involved is deoxyribose, not ribose (which is found in RNA).
Recognize that the nitrogenous bases form the "rungs" of the ladder, connected by hydrogen bonds, not the sides.
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