Fewpal
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Chargaff's rule states that in an organism 

(a) amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C) 

(b) amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C) 

(c) amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G) 

(d) amounts of all bases are equal.

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The correct option is (a).

Chargaff's rule states that DNA from any cell of all organisms should have a 1:1 ratio (base pair rule) of pyrimidine and purine bases and, more specifically the amount of guanine is equal to cytosine and the amount of adenine is equal to thymine.

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