Multiple Choice
In the double helix structure of DNA, which nitrogenous base forms hydrogen bonds with adenine?
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7. DNA and Chromosome Structure
DNA Structure
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Which components make up the backbone of the DNA molecule?
A
Deoxyribose sugars and nitrogenous bases
B
Nitrogenous bases and phosphate groups
C
Adenine and thymine pairs
D
Alternating phosphate groups and deoxyribose sugars
Verified step by step guidance1
Recall the structure of the DNA molecule, which consists of a long chain of nucleotides.
Understand that each nucleotide is composed of three parts: a phosphate group, a deoxyribose sugar, and a nitrogenous base.
Recognize that the backbone of the DNA molecule is formed by the repeating pattern of phosphate groups and deoxyribose sugars linked together by phosphodiester bonds.
Note that the nitrogenous bases (adenine, thymine, cytosine, and guanine) are attached to the deoxyribose sugars and project inward, pairing with complementary bases on the opposite strand.
Conclude that the backbone is specifically made up of alternating phosphate groups and deoxyribose sugars, not the nitrogenous bases.
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