Multiple Choice
In the DNA double helix, how are the two complementary strands held together?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In the context of DNA structure, which set correctly lists the three components of a DNA nucleotide?
A
A phosphate group, a ribose (5-carbon) sugar, and a nitrogenous base
B
A deoxyribose (5-carbon) sugar, a nitrogenous base, and an amino acid
C
A phosphate group, glycerol, and a nitrogenous base
D
A phosphate group, a deoxyribose (5-carbon) sugar, and a nitrogenous base
Verified step by step guidance1
Recall that a nucleotide, the basic building block of DNA, consists of three main components: a sugar, a phosphate group, and a nitrogenous base.
Identify the sugar component specific to DNA, which is deoxyribose, a 5-carbon sugar lacking one oxygen atom compared to ribose found in RNA.
Recognize that the phosphate group is a key part of the nucleotide backbone, linking sugars of adjacent nucleotides through phosphodiester bonds.
Understand that the nitrogenous base is attached to the sugar and can be one of four types in DNA: adenine, thymine, cytosine, or guanine.
Combine these components to confirm that the correct set for a DNA nucleotide is: a phosphate group, a deoxyribose (5-carbon) sugar, and a nitrogenous base.
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