CELL STRUCTURES AND FUNCTION
BIO MOLECULES
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

If you have 40 adenine in a DNA molecule, how many thymine can you expect?

20


30


40


50

Explanation:
Detailed explanation1: According to Chargaffâ€™s rule, Concentration of adenine=concentration of thymine. therefore if [A]=40% then the [T] will also be 40%.
Detailed explanation2: Answer: There would be 20% Cytosine.
Detailed explanation3: 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.
Detailed explanation4: Therefore, the answer is T = 30%, A = 30%, G = 20% and C = 20%.
Detailed explanation5: If 20 bases are thymine, then 20 bases must be adenine. So that makes 40 bases between adenine and thymine. 100 minus 40 is 60. So there must be 60 bases between guanine and cytosine.
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