Nucleotides Chemistry || NEET PG || Biochemistry

This video is on chemistry of Nucleoside, Nucleotides, Biologically important mucleotides and structural analogs of nucleotides.
Nucleic acids are polymers of nucleotides, linked by phosphodiester bond, they are therefore called polynucleotides.
The nucleic acids are of two main types:
Deoxyribonucleic acid or DNA
Ribonucleic acid or RNA.
DNA is present in nuclei and small amounts are also present in mitochondria, whereas 90% of the RNA is present in cell cytoplasm and 10% in the nucleolus.
Structure And Functions Of Nucleotides
Each nucleotide consists of three components:
1. A nitrogenous base
2. A pentose sugar
3. A phosphate group.
Nitrogenous Bases of RNA and DNA
Two classes of nitrogenous bases , purines and pyrimidines are present in RNA and DNA.
Purine Bases
Two principal purine bases found in DNAs, as well as RNAs are:
Adenine (A)
Guanine (G).
Pyrimidine Bases
Three major pyrimidine bases are:
Cytosine (C)
Uracil (U)
Thymine (T).

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