Question

Group the following as nitrogenous bases and nucleosides: Adenine, Cytidine, Thymine, Guanosine, Uracil, and Cytosine.

Answer 1

Hint: Nucleotides and nucleosides are considered as building blocks of the nucleic acids, and the components of the nucleotide are Sugar molecule, phosphate, and nitrogenous base and the difference of nitrogenous base is the same, except the absence of phosphate molecule.

Complete answer:
- The nucleotides and nucleosides are the same except the absence of phosphate base.
- They are again divided into purines and pyrimidines.
- While Adenine, guanine is the purine’s and cytosine, thymine, uracil.
- A nucleotide is nothing but, nucleoside without pentose sugar.
- Nucleosides are used as anticancer and antiviral agents.
- Examples of nucleotide and nucleoside are adenine, guanine, and cytosine, thymine, uracil.
- Nucleoside and nucleotides have very important functions, as they act as data storage in DNA and RNA.
- These help in coenzyme catalysis.

> Nitrogenous base
- It is the organic base attached to the nitrogen molecule.
- The chemical properties of this organic molecule are base. It has basic properties.
- This is attached to the phosphate molecule at 3’.
- The nitrogenous base is considered to be a derivative of two important structures such as purine and pyrimidines.
- They are nonpolar, due to their aromaticity, they are planar.
- In biological science, nitrogen bases are considered as nucleobases as they play a vital role in the formation of the nucleic acids.
- So from the above-given questions, cytidine, and guanosine have come under nitrogen bases.

Hence, the correct answer is option (B).

Note: As the nitrogen bases have a flat shape, they are considered as a very important role in the building block of nucleic acids, and nitrogenous base actually owns it’s. Basic properties due to the presence of a lone pair of electrons.