THE MOLECULAR BASIS OF INHERITANCE
STRUCTURE OF NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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24%
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26%
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48%
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52%
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Detailed explanation-1: -Answer and Explanation: The correct answer: A DNA molecule with 24% guanine would have 26% adenine. The rules for complementary DNA base pairing are that adenine pairs with thymine and guanine pairs with cytosine.
Detailed explanation-2: -Therefore, given 27 percent of thymine, there is also 27 percent of adenine. Thus, the amount of guanine and cytosine would have 100-27(2)= 46, which follows that there is 23 percent of cytosine (46/2).
Detailed explanation-3: -The percentage of guanine is 20%.
Detailed explanation-4: -Answer: There would be 20% Cytosine. Adenine (30%) = Thymine (30%) Guanine (20%) = Cytosine (20%)
Detailed explanation-5: -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. In a double stranded DNA molecule, the percentage of cytosine is 18.