OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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30
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15
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20
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60
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Detailed explanation-1: -Therefore if there is 30% thymine in DNA then 30% adenine would be present in the DNA which makes a total of 60%. The rest 40% is made by cytosine and guanine. So cytosine will make 20% and guanine will make 20% of nucleotide in the DNA. Therefore the correct answer is 20%.
Detailed explanation-2: -Answer and Explanation: A double-stranded DNA molecule with 20% thymine would contain 30% guanine.
Detailed explanation-3: -If a DNA sample is made up of 30% guanine, then it must contain an equal amount (30%) of cytosine (C). So, for this DNA sample, C + G = 60%. The remaining 40% of the sequence must consist of A-T pairs (adenine-thymine). Therefore, 20% of the sample is made up of adenine, and 20% of the sample is made up of thymine.
Detailed explanation-4: -So, the correct option is ‘30% is guanine’.