Multiple Choice
Which set correctly lists the four nitrogenous bases found in DNA?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In the DNA double helix, the backbone of each strand is primarily composed of which components?
A
Nitrogenous bases paired by hydrogen bonds
B
A continuous chain of amino acids linked by peptide bonds
C
Alternating deoxyribose sugars and phosphate groups
D
Ribose sugars linked to phosphate groups
Verified step by step guidance1
Recall the structure of the DNA double helix, which consists of two strands forming a twisted ladder-like shape.
Understand that each strand has a backbone and nitrogenous bases. The bases pair in the center via hydrogen bonds, but they are not part of the backbone.
Identify the components of the backbone: it is made up of sugar molecules and phosphate groups linked together.
Specifically, in DNA, the sugar is deoxyribose, and it alternates with phosphate groups to form the continuous backbone.
Recognize that amino acids and ribose sugars are not part of the DNA backbone; amino acids are building blocks of proteins, and ribose sugars are found in RNA, not DNA.
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