Answer:
Nucleotides are the subunits of DNA. The four nucleotides are adenine, cytosine, guanine and thymine. Each of the four bases has three components, a phosphate group, a deoxyribose sugar and a nitrogen-containing base. The nitrogenous base attached to the bases may be a double-ringed purine or a single-ringed pyrimidine.
Step-by-step explanation:
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