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Which nitrogenous base is not found in DNA?
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7. DNA and Chromosome Structure
DNA as the Genetic Material
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Which best describes how the genetic code is stored in DNA?
A
As a sequence of amino acids linked by peptide bonds
B
As a pattern of phosphate groups along the sugar-phosphate backbone
C
As a sequence of nitrogenous bases (adenine, thymine, cytosine, and guanine)
D
As a series of ribose sugars connected by hydrogen bonds
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Understand that DNA stores genetic information in the form of a sequence of chemical units called nitrogenous bases.
Recall that the four nitrogenous bases in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G).
Recognize that these bases are arranged in a specific order along the DNA strand, and this sequence encodes genetic instructions.
Note that the sugar-phosphate backbone provides structural support but does not store the genetic code itself.
Conclude that the genetic code is best described as a sequence of nitrogenous bases, not amino acids, phosphate groups, or ribose sugars.
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