Here is a notes of Biochemistry and clinical pharmacy, Chapter -5 Nucleic acid. Hopefully will be useful for you.

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3. Example-Purines (adenine and
guanine) are two-carbon nitrogen
ring base.
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8.  Nucleotides are organic
molecules consisting of a
nucleoside and a phosphate.
 They serve as monomeric units
of the nucleic acid polymers –
deoxyribonucleic acid and
ribonucleic acid.
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10. Nucleotide structure
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12. Structure of DNA double helix
The salient features of double helix
structure of DNA are as follows:
 It is made up of two polynucleotide
chains.
 The two chains have antiparallel polarity
if one has polarities and the second
chain must have polarity.
 The base into strands is paired through
hydrogen bond forming base pairs.
Adenine forms to hydrogen bonds with
thymine from opposite strands and vice
versa.

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