Question

Adenine and guanine are two-
(a) Nucleosides
(b) Salts
(c) Nucleotides
(d) purine

Answer 1

It is a carbon and nitrogen-based aromatic heterocycle. Adenine and guanine, which participate in the creation of DNA and RNA, include purines. Other essential biomolecules, such as ATP, GTP, cyclic AMP, NADH, and coenzyme A, are also constituents of this.

Complete answer:
Nitrogenous bases that make up the two distinct forms of nucleotide bases in DNA and RNA are purines and pyrimidines. Purines are the two-carbon ring bases of nitrogen (adenine and guanine), while pyrimidines are the one-carbon bases of nitrogen rings (thymine, cytosine, and uracil) .
Adenine is one of the two nucleobases of purine (the other being guanine) used in the nucleotide production of nucleic acids. In DNA, adenine binds via two hydrogen bonds to thymine to help stabilize the structures of the nucleic acid. Adenine binds to uracil in RNA, which is used for protein synthesis.
Guanine is one of the four key nucleobases present in DNA and RNA nucleic acids, with adenine, cytosine, and thymine being the others. Guanine is combined with cytosine in DNA. The nucleoside of guanine is called guanosine.

Additional information: One of the DNA and RNA structural elements, or building blocks, is a nucleotide. A nucleotide consists of a base (one of four substances: adenine, thymine, guanine, and cytosine) plus a sugar molecule and a phosphoric acid molecule.
A nucleoside, i.e. nucleoside= nucleobase + ribose or deoxyribose, is a purine or pyrimidine nucleobase bound to a pentose sugar ribose or deoxyribose. A nucleoside is a glycoside that is formed by nucleic acid hydrolysis.
Salt is a chemical compound in chemistry that consists of an ionic assembly of cations and anions. Salts consist of related numbers of cations (positively charged ions) and anions (negatively charged ions) in order to be electrically neutral (without a net charge) to the substance.
So, the correct answer is ‘Purine’.

Note: The purine bases are metabolized into uric acid in the absence of HPRT since they cannot be recycled. In addition, regulatory changes in the synthesis of purines result in increased purine synthesis through the de novo pathway. Such two processes cause overproduction of uric acid.