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JIPMER 2019
Exam
JIPMER
Year
2019
Subject
Zoology
Chapter
Molecular Basis of Inheritance

JIPMER 2019 · Zoology · Molecular Basis of Inheritance

In DNA 20 \% bases are adenine. What percentage of bases are...

In DNA 20%20 \% bases are adenine. What percentage of bases are pyrimidines?

Options

  1. A30%30 \%
  2. B60%60 \%
  3. C50%50 \%
  4. D20%20 \%

Correct answer

C. 50%50 \%

Step-by-step solution

According to chargaff's rule A+\mathrm{A}+\mathrm{G}=\mathrm{C}+T=50%∴+\mathrm{T}=50 \% \therefore \quad If A=20%\mathrm{A}=20 \% then T=20%\mathrm{T}=20 \%C+T=50%C=50%−20%=30%\begin{aligned} \mathrm{C}+\mathrm{T} & =50 \% \\ \mathrm{C}=50 \%-20 \% & =30 \% \end{aligned}$TotalpercentageofpyrimidinebasesTotal percentage of pyrimidine bases(\mathrm{T}+\mathrm{Q}) \text{ are } 20+30=50 \%$
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