Answer: A ( NUCLEOTIDE)
Step-by-step explanation:
A nucleotide is a monomer used in the building of nucleic acids.
nucleotides
The monomer units of DNA are nucleotides, and the polymer is known as a "polynucleotide." Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen containing base attached to the sugar, and a phosphate group
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