1.

What are nucleotides ? Describe their structure.

Answer»

Nucleotides are the building blocks of nucleic acids. They are composed of three subunit molecules: 

(i) Nitrogenous bases : Cytosine (C). Thymine (T), Adenine (A), Guanine (G). 

(ii) Five carbon sugar. 

(iii) Phosphate group. 

The phosphate group and 5-carbon sugar compose the backbone of the double helix, while the nitrogenous bases are located in the middle and are bonded to each other.



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