Question

Adenine is a

a. Purine

b. Pyrimidine

c. Nucleoside

d. Nucleotide

Answer 1

Hint: Adenine (An) is one of four nucleotide bases in DNA, with the other three being cytosine (C), guanine (G), and thymine (T). Inside the DNA particle, adenine is situated concerning one strand structure by sharing bonds with thymine bases on the contrary strand. The succession of four DNA bases encodes the cell's hereditary information.

Complete answer:

> 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) . Purines pair with the pyrimidines by hydrogen bonds.

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.

The purines are a twofold ring structure while the pyrimidines are a single ring composed of carbon and nitrogen. Along these lines, the right answer is A.

> Pyrimidine is a natural compound. The two types of nitrogenous bases present in the nucleotide are purine and Pyrimidine. 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.

 So, option B is incorrect.

> A nucleoside bonds with a phosphate group through a phospho-ester bond resulting in a nucleotide. A nucleoside consists essentially of a nucleobase and a five-carbon sugar while a nucleotide is made out of a nucleobase, a five-carbon sugar, and at least one phosphate group. So, option C is incorrect.

> A nitrogenous base, a pentose sugar, and a phosphate group are the three components of a nucleotide. Nitrogenous bases that make up the two distinct forms of nucleotide bases in DNA and RNA are purines and pyrimidines. So, option D is incorrect.

Hence, the correct answer is option (A).

Note: Purines and pyrimidines make up the two gatherings of nitrogenous bases, including the two gatherings of nucleotide bases. Two of the four deoxyribonucleotides (deoxyadenosine and deoxyguanosine) and two of the four ribonucleotides (adenosine, or AMP, and guanosine, or GMP), the particular structure squares of DNA and RNA, are purines. To shape DNA and RNA, the two purines and pyrimidines are required by the cell in around equivalent amounts. Both purine and pyrimidine are self-restraining and enacting. At the point when purines are shaped, they restrain the compounds required for more purine arrangement.