A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: C
Solution :
The bases of nucleic acids are of two types (i) pyrimidines and (ii) purines. Adenine and guanine are double-ring bases called purines; cytosine, thymine and uracil are single-ring bases called pyrimidines.
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