THE MOLECULAR BASIS OF INHERITANCE
THE SEARCH FOR INHERITABLE MATERIAL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In a certain gene, 15% of the DNA is thymine, how much of it is adenine?
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15
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35
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30
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70
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Explanation:
Detailed explanation-1: -Chargaff’s rules explained that adenine always pairs with thymine and cytosine always pairs with guanine in a DNA molecule. Since adenine pairs with thymine, for every adenine base there will also be one thymine base. Thus, a sample with 15% adenine must also have 15% thymine.
Detailed explanation-2: -Thus, if DNA molecule contains 15% adenine then C and G will constitute 70%, out of which guanine will be 35%.
Detailed explanation-3: -If T=15%, then C=[100−15(2)]/2=35%
Detailed explanation-4: -In a strand of DNA composed of 15% cytosine, what amount of thymine would be found in this DNA? There would be 70% adenine and thymine in the DNA. This would mean that there is 35% thymine.
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