Multiple Choice
In DNA structure, what is the backbone of DNA primarily composed of?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
In DNA structure, what determines the genetic code (information) carried by a DNA molecule?
A
The overall diameter and helical twist of the DNA double helix
B
The sequence (order) of nucleotide bases along the DNA strand
C
The sugar-phosphate backbone alone, regardless of base order
D
The number of hydrogen bonds in a double helix (2 vs 3) independent of base sequence
Verified step by step guidance1
Understand that DNA is composed of a sugar-phosphate backbone and nitrogenous bases (adenine, thymine, cytosine, guanine).
Recognize that the sugar-phosphate backbone provides structural support but does not carry genetic information.
Focus on the sequence (order) of the nitrogenous bases along one strand of DNA, as this sequence encodes genetic information.
Recall that the genetic code is determined by the specific order of bases, which dictates the sequence of amino acids in proteins.
Note that features like the overall diameter, helical twist, or number of hydrogen bonds contribute to DNA stability but do not determine the genetic code.
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