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CHROMATIN, phosphate and sugar are arranged lengthwise and a nitrogenous…

- - - - ( useless info)
        
        first studied by Rosalind Franklin.
        
        Watson Crick
        
        Dna- double helix strand bcuz Inter-twisted
        
        they proposed the double stranded helical structure of DNA
      - the DNA molecule is very large and hence it is described as macromolecule.
        
        Each single DNA strand in composed of repeating nucleotides
        
        nucleotides
        
        made of 3 components
        
        nitrogenous base
        
        nucleoside
        
        there r 4 types of nitrogenous base:
        
        4 more items...
        
        sugar
        
        nucleosome
        
        1 more item...
        
        (Pentose)
        
        phosphate
  - - - histones are proteins which help in coiling and supercoiling of DNA into structural units called nucleosomes.
        
        One nucleosome= 0ne double DNA helix +8 histones
        
        millions of nucleosomes = chromatin network

phosphate and sugar are arranged lengthwise and a nitrogenous base is attached to the sugar inwards.

  Complementary base pairing  is the way in which the nitrogenous  bases of the two strands are joined together using hydrogen bonds.