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what is the structure of a nucleotide? what are the compennets of a DNA helix? what...

what is the structure of a nucleotide? what are the compennets of a DNA helix? what is Chargaffs base pir rule?
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Nucleotides are basic building blocks of DNA/RNA. It consist of sugar(deoxyribose in DNA and Ribose in RNA), Nitrogen base((cytosine (C), thymine (T), adenine (A), guanine (G) Uracil(U)) and phosphate group.

DNA helix is made up of of six smaller molecules i.e. a five carbon sugar known as deoxyribose, four different nitrogenous bases (A,T,G,C) a phosphate molecule.

Chargaff's rules of base pair in DNA state that DNA from any cell of any organisms should have a 1:1 ratio of pyrimidine and purine and the amount of Guanine should be equal to Cytosine and the amount of Adenine should be equal to Thymine.(i.e . in any cell of any organism the A=T and G=C)

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