In a nucleotide, the nitrogenous base is attached to the sugar's carbon and the phosphate group is attached to the sugar's carbon. a. 1' 5'b. 2' 3'c. 2' 1'd. 1' 2'e. 1' 3'

A. 1' ... 5'

Explanation:

The pentose sugars present in nucleotides have five-carbon structures. Other components of a nucleotide are a phosphate group and a nitrogenous base. The nitrogenous base in a nucleotide can be a purine or pyrimidine. The purine bases are covalently joined to the 1' carbon atom of the pentose sugar at their N-9. The bond between the nitrogenous base and a pentose sugar is called the N-beta glycosyl bond.

Similarly, N-1 of a pyrimidine base is covalently linked to the 1' carbon of the pentose sugar. The phosphate group of a nucleotide is bonded to the 5' carbon of the pentose sugar.

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