Take note that the basic unit of a DNA molecule is a (deoxyribo)nucleotide.
Each nucleotide consists of :
1) A sugar-phosphate group -- deoxyribose)sugar + phosphate group
--> makes up the backbone of a the DNA molecule
2) A nitrogenous base (Adenine / Thymine / Guanine / Cytosine) which encodes for genetic information.
You should be able to identify these different components in a DNA molecule.
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