Multiple Choice
In the DNA double helix, what type of interaction must be disrupted for the two strands to separate during processes such as replication or PCR denaturation?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA structure, what components form the backbone of the DNA molecule?
A
Two strands of amino acids linked by peptide bonds
B
Alternating nitrogenous bases and phosphate groups linked by hydrogen bonds
C
Alternating deoxyribose sugars and phosphate groups linked by phosphodiester bonds
D
Alternating ribose sugars and phosphate groups typical of RNA
Verified step by step guidance1
Recall the basic structure of DNA, which consists of two long strands forming a double helix.
Identify the components that make up each strand: a sugar, a phosphate group, and a nitrogenous base.
Understand that the backbone of each DNA strand is formed by alternating sugar and phosphate groups.
Recognize that in DNA, the sugar is deoxyribose, and the sugar and phosphate groups are connected by phosphodiester bonds.
Note that the nitrogenous bases are attached to the sugar and pair with bases on the opposite strand via hydrogen bonds, but they do not form the backbone.
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