The biochemical analysis of a sample of DNA shows that 32% of the nitrogenous bases are cytosine. What is the total % of adenine and uracil in RNA transcribed from this DNA?
Correct answer: D. 36%
- A. 16%
- B. 18%
- C. 32%
- D. 36%
Explanation
32% of the nitrogenous bases are cytosine so 32% of the nitrogenous bases are guanine, according to Chargaff's rule. This makes a total of 64%. The remaining percentage is 36%. So, half of this i.e. 18% will be of adenine and 18% will be of thymine in DNA. As Adenine is translated into uracil in mRNA, therefore, uracil is also 18% in mRNA. So, total will be 36%.
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