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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Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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