BIOLOGY
NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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20%
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30%
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35%
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70%
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Detailed explanation-1: -The percentage of guanine is 20%.
Detailed explanation-2: -Adenine (30%) = Thymine (30%) Guanine (20%) = Cytosine (20%) Therefore, 60% A-T and 40% C-G.
Detailed explanation-3: -Option A is correct ans Thymine −30%, Guanine −20%, Cytosine −20% (Chargaffs nitrogen base pairing rule which states that amount of Adenine is equal to Thymine and Guanine is equal to Cytosine.
Detailed explanation-4: -Thymine – 30%, Guanine – 20%, Cytosine – 20%. Chargaff’s nitrogen base pairing rule which states that amount of adenine is equal to thymine and guanine is equal to cytosine.
Detailed explanation-5: -Hence, the sum of the purine residues equals the sum of the pyrimidine residues; i.e. A + G = T + C. Here, [A] = 30%, therefore, % of [T] is also 30%. Thus, [G]+[C] = 100-60 = 40%. [G] = 20% and [C] = 20%.