Question

Cytidine is a
A. Nitrogenous base
B. Nucleoside
C. Nucleotide
D. Nucleic acid

Answer 1

Hint:An organic molecule that is the building block of DNA and RNA is a nucleotide. Nucleosides in all living organisms are responsible for encoding, transmitting, and expressing genetic material.

Complete answer:
The cell's principal information-carrying molecules are nucleic acids. Deoxyribonucleic acid (DNA) and ribonucleic acid are the two principal groups of nucleic acids (RNA).
Nucleic acids are formed when many nucleotides join together to form a chain.
Nucleotides: Three components make up each nucleotide:
A nitrogen-base
A (five-carbon) pentose sugar
A group of phosphates
Nitrogenous Base: Organic molecules are nitrogen bases and are so named because they contain carbon and nitrogen: adenine (A), cytosine (C) of guanine (G), and thymine (C) (T). Purines are known as adenine and guanine. Pyrimidines are known as cytosine, thymine, and uracil.
The Five-Carbon sugar: In DNA, the pentose sugar is deoxyribose and it is ribose in RNA.
Phosphate Group
The hydroxyl group of the 5' carbon of one sugar and the hydroxyl group of the 3' sugar carbon of the next nucleotide is bound to the phosphate base.mIt is not appropriate to confuse nucleotides with nucleosides. There is no phosphate group in the nucleosides. It yields a nucleotide when a nucleoside is bound to a phosphate group. Cytidine, uridine, adenosine, guanosine, thymidine, and inosine are all examples of nucleosides.
Examples of nucleotides with only one group of phosphates
Monophosphate adenosine (AMP)
Monophosphate guanosine (GMP)
Monophosphate cytidine (CMP)

Thus from the above discussion, it is clear that cytidine is a nucleoside thus the correct answer is option B Nucleoside.

Note: Perhaps the most important molecules in cell biology are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), responsible for storing and reading genetic information that underpins all life. DNA has a double helix structure. It is double-stranded.