Multiple Choice
Why is DNA commonly referred to as a double-helix model?
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7. DNA and Chromosome Structure
DNA Structure
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Which of the following would be true of any given DNA molecule?
A
The two strands run in the same direction (parallel).
B
Uracil is present instead of thymine.
C
The amount of adenine equals the amount of thymine.
D
The amount of guanine equals the amount of thymine.
Verified step by step guidance1
Recall the basic structure of DNA: it is a double-stranded molecule where the two strands run in opposite directions, meaning they are antiparallel, not parallel.
Understand the nitrogenous bases in DNA: adenine (A), thymine (T), guanine (G), and cytosine (C). Uracil (U) is found in RNA, not DNA.
Apply Chargaff's rules, which state that in any double-stranded DNA molecule, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine.
Evaluate each statement based on these principles: the strands are antiparallel, uracil is not present in DNA, adenine pairs with thymine, and guanine pairs with cytosine.
Conclude that the true statement for any given DNA molecule is that the amount of adenine equals the amount of thymine.
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