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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0%
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15%
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35%
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70%
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Detailed explanation-1: -If a DNA sample were composed of 15% adenine then there would also be 15% thymine according to Chargaff’s rules. Chargaff’s rules explained that adenine always pairs with thymine and cytosine always pairs with guanine in a DNA molecule.
Detailed explanation-2: -Correct answer: Together, adenine and thymine compose 70% of the segment. This means that 30% of the section is composed of guanine-cytosine pairs. Since these two bases will be equal in quantity, 15% of the DNA section will be cytosine bases.
Detailed explanation-3: -The total of both is 40%. From 100 remains 60% which is divided equally between guanine and cytosine, so each is 30%. Uracil is not found in DNA but it will have the same percentage as thymine, i.e the RNA will have 30% uracil.
Detailed explanation-4: -Terms in this set (17) if 15% of the nucleotides in a DNA molecule contain guanine, what percentage of the nucleotides contain each of the other bases? explain your reasoning. cytosine has 15% if guanine does, so 100-15-15 is 70. then you divide 70 by 2 and you get 35% which are the percentages for adenine and thymine.