Multiple Choice
In DNA structure, which nitrogenous base forms complementary base pairs with thymine (T) via hydrogen bonds?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In the DNA double helix often described as a twisted ladder, what molecules form the “stairs” (rungs) of the ladder?
A
Alternating deoxyribose sugars and phosphate groups forming the sugar-phosphate backbone
B
A single continuous strand of deoxyribose sugars attached directly to another sugar strand
C
Amino acids linked by peptide bonds
D
Pairs of nitrogenous bases (A with T, and G with C) held together by hydrogen bonds
Verified step by step guidance1
Recall the structure of the DNA double helix, which is often described as a twisted ladder.
Identify the components of the DNA ladder: the sides (backbone) and the rungs (stairs).
Understand that the backbone of DNA consists of alternating deoxyribose sugars and phosphate groups, which form the sides of the ladder.
Recognize that the rungs or stairs of the ladder are formed by pairs of nitrogenous bases, specifically adenine (A) pairing with thymine (T), and guanine (G) pairing with cytosine (C).
Note that these base pairs are held together by hydrogen bonds, which stabilize the double helix structure.
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