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compare the structure of purines and pyrimidines.Can you find out why distance between two polynucleotide chains in DNA remains almost same

Dear Student,

Please find below the solution to the asked query:


Purines and Pyrimidines are two types of nitrogen containing bases. Purines consist of two rings (six-membered and a five-membered nitrogen-containing ring), fused together.

Pyridmidines have only a six-membered nitrogen-containing ring. Purine includes Adenine and Guanine and Pyrimidine includes Cytosine and Thymine in DNA and Uracil in RNA.




The distance between both the polyneucleoide chains is same because the pattern of bonding is same all the polynucleotide chains.

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this has two reasons:-
  1. the alternate AT & GC pairs with double and triple bonds respectively causes a uniformly same distance b/w bases 
  2. the serial order stacking of bases in each strand of dna is also responsible for the uniform distance
and for the structures of purines and pyrimi.. i will refer you to XII CHEMISTRY(PART II-chapt-).becoz  here it is not possible to draw the structures
hope u will understand this........
thank u
 
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