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Purines and Pyrimidines...

Purines and Pyrimidines

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Differences between purines and pyrimidines are as follows
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Correct the statements if required by changing the underlined words: Adenine, thymine and uracil are pyrimidines.

Correct the statements if required by changing the underlined words: Pyrimidine thymine is present in RNA.

Assertion : The heterocyclic compounds in nucleic acid are the nitrogenous bases. Reason : Adenine and guanine are substituted pyrimidines while uracil, cytosine and thymine are substituted purines.

The fact that a purine base always paired through hydrogen bonds with a pyrimidine base leads to , in the DNA double helix :

A DNA segment has a total of 1000 nucleotides, out ofwhich240 of them are adenine containing nucleotides. How many pyrimidine bases this DNA segment possesses?

Purines have nitrogen atoms at _____ positions.