THE MOLECULAR BASIS OF INHERITANCE
DNA MAKES RNA MAKES PROTEIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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14%
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36%
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72%
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28%
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Detailed explanation-1: -Solution: In DNA Thymine and Adenine exist in equal proportions and Cytosine and Guanine also exist in 1:1 ratio. If Thymine is 14%, Adenine is also 14%. In the remaining 100 – 14-14 = 72%, Guanine and Cytosine exist in equal proportions i.e. 36% and 36%.
Detailed explanation-2: -According to Chargaff’s rule in a DNA molecule A = T and G = C and A + G + C + T = 100%. Here cytosine (C) is 18% hence G = 18% ∴ A + T = (100 – 36)% ∴ A + T = 64% ∴ A = 32% Q.
Detailed explanation-3: -The DNA of an organism is studied and found to contain 14% guanine. This organism should have 36% thymine and 14% cytosine in its DNA. The proportion of guanine is the same as cytosine and that of thymine is the same as adenine due to complementary base pairing rules.
Detailed explanation-4: -The percentage of guanine is 20%.
Detailed explanation-5: -Since cytosine and guanine are always present in equal numbers, the percentage of guanine molecule is 30%.