Nucleic Acids Questions and Answers Discussion Page.

9.	A purified DNA sample of leaf contains 20.0 mole of guanine. Calculate the approximate percentage of purine residues?
	A.	30%
	B.	40%
	C.	50%
	D.	60%

	Answer: Option A


	Explanation:
	According to chargaff’s rules, C=G= 20%; A=T (A+G) + (T+C) =100% (A+20) + (T+20) =100% (A+20) + (A+20) = 100% 2A= 100-40% A = 30%.



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