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Which of the following combinations of base pairs will be found in a molecule of DNA?
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7. DNA and Chromosome Structure
DNA Structure
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The genetic information is coded in DNA by the:
A
sequence of nitrogenous bases
B
number of phosphate groups
C
length of the sugar-phosphate backbone
D
ratio of purines to pyrimidines
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Understand that DNA stores genetic information in a specific way that allows it to be read and translated into proteins.
Recall 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 encode genetic information itself.
Focus on the nitrogenous bases, which pair specifically (A with T, C with G) and whose order determines the genetic code.
Conclude that the sequence (order) of nitrogenous bases along the DNA strand is what encodes genetic information.
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