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Answer:
The subunits of the DNA molecule are the nucleotides, which are its monomers and which are conformed at the same time by other structures, such as (1) one or two carbon sugar rings known as pentoses or deoxyriboses; (2) a phosphate group at the 5' carbon atom; the lack of an oxygen atom at the 2' carbon atom of the ring; and (3) the nitrogenous bases, which are Adenine, Cytosine, Thymine, and Guanine.
Step-by-step explanation:
About whether the nucleotide has one or two carbon rings, it's important to say that it depends on the kind of nitrogenous bases, which could be pyrimidines (Cytosine and Thymine), and purines (Adenine and Guanine) having one carbon ring and two carbon rings, respectively. With this clear, we can say that both pyrimidines and purines complement each other, so they can't pair with another nucleotide of the same nature (pyrimidines and pyrimidines, or purines and purines can't match together, but pyrimidines and purines can do it), because of the number of hydrogen bonds they can share among them (2 hydrogen bonds between thymine and adenine, and 3 hydrogen bonds between guanine and cytosine).
The main functions of these three different parts of the nucleotide are to give the DNA molecule stability to avoid being denaturated and to store the genetic information which will be required for protein production.
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AshtheNeko