THE MOLECULAR BASIS OF INHERITANCE
DNA MAKES RNA MAKES PROTEIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Adenine
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Guanine
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Cytosine
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Nucleus
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Detailed explanation-1: -There are four nitrogenous bases in DNA, two purines (adenine and guanine) and two pyrimidines (cytosine and thymine). A DNA molecule is composed of two strands.
Detailed explanation-2: -If 10% of the bases in a DNA are adenine, 10% of this DNA molecule must be thymine. The remaining 80% will be made up of 40% cytosine and 40% guanine since the bases pair with each other leaving a ratio of 1:4.
Detailed explanation-3: -Guanine (G) in DNA is one-to-one coupled to cytosine (C), so that also makes up for 10%. Then there’s 80% left for the other one-to-one couple: Thymine (T) and adenine (A). So 40% T and 40% A.
Detailed explanation-4: -Since cytosine and guanine are present in equal amounts, we can simply divide their sum by 2. The final composition is 22% adenine, 22% thymine, 28% cytosine, and 28% guanine.