Apyrimidine is joined covalently to the pentose sugar through the: a) n-1 of the base to the 1 carbon of the pentose. b) n-9 of the base to the 1 carbon of the pentose.

A) N-1 of the base to the 1 carbon of the pentose.

Explanation:

Nucleoside is the combination of both the sugar molecule and the base attached to it.

There are two kinds of bases, which are:- purine (contains Adenine and Guanine) and pyrimidine (contains Cytosine, Thymine and Uracil). The base is pyrimidine, then the N-1 of the nitrogenous base is attached to C-1' of the parent chain. While if the base is purine, then the N-9 of the nitrogenous base is attached to C-1' of the parent chain.

Hence, The answer is:- N-1 of the base to the 1 carbon of the pentose.

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