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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Based on Chargaff’s rule for base pairing, if a DNA molecule contains 30.9% adenine, what is the MOST likely percentage of thymine?
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19.8%
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22.2%
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29.8%
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17.1%
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Explanation:
Detailed explanation-1: -Specifically, that in any double-stranded DNA the number of guanine units equals approximately the the number of cytosine units and the number of adenine units equals approximately the number of thymine units. Human DNA is 30.9% A and 29.4% T, 19.9% G and 19.8% C.
Detailed explanation-2: -The percentage of guanine is 20%.
Detailed explanation-3: -There would be 20% Cytosine. Adenine (30%) = Thymine (30%)
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: -Therefore, the answer is T = 30%, A = 30%, G = 20% and C = 20%.
There is 1 question to complete.