Through its replication, DNA acts as the key to heredity. This unique property of DNA is at the root of all reproduction. (i) Self - Replication or self -DuplicationĭNA has the property of self - replication. (j) In prokaryotic cell and mitochondria, circular DNA is present. (i) DNA is attached with histone protein. (h) Purine and pyrimidine are found in ratio 1 : 1 cells. (g) A always attaches with T while C always attaches with G. (f) In both chains, in between A and T, 2 Hydrogen bonds are present while in C and G, 3H bonds are present. (e) Sugar and phosphorous are alternately arranged. (d) Nucleotide are joined by 3' → 5' phosphodiester bonds. (b) DNA in double stranded structure is made up of two chains of polynucleotides. (a) Double Helical model of DNA was proposed by biochemist J.D.Watson, British chemist FHC Crick in 1953. (c) All nucleotides combined and form a chain called polynucleotides by which RNA and DNA are formed. (a) Nitrogen base Sugar Phosphate → Nucleotide. When nitrogen base is combined with deoxyribose sugar, it constitutes a nucleoside. (d) Fischer discovered Nitrogen bases in 1888. (c) They are also found in Mitochondria, centriole and chloroplast. (b) Control the metabolic activities of cell. (a) These are special type of acids which are present in nucleus & cytoplasm.
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