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Which of the following is NOT a nucleotide found in DNA?
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7. DNA and Chromosome Structure
DNA Structure
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How many different types of nucleotides are present in DNA?
A
4
B
2
C
5
D
8
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Recall that DNA is composed of nucleotides, which are the basic building blocks of the molecule.
Each nucleotide in DNA consists of three parts: a phosphate group, a sugar molecule (deoxyribose), and a nitrogenous base.
The key to identifying different types of nucleotides lies in the nitrogenous bases, which vary and define the nucleotide type.
In DNA, there are four different nitrogenous bases: adenine (A), thymine (T), cytosine (C), and guanine (G).
Therefore, the number of different types of nucleotides in DNA corresponds to the number of these four bases.
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