THE MOLECULAR BASIS OF INHERITANCE
DNA REPLICATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
42%
|
|
|
31%
|
|
|
16%
|
|
|
8%
|
Detailed explanation-1: -Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine? 8% (In this example cytosine makes up 42%, which means that guanine also makes up 42%. So 84% of the DNA is a G-C base pair.
Detailed explanation-2: -Thymine (T) makes up 28% of the nucleotides in a sample of DNA from an organism.
Detailed explanation-3: -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-4: -Therefore, Guanine would be 20% and total of G+C = 40% and hence A+T would be 60% that is 30% each. Hence, option C is correct answer.