Q100 / 200 · NEET 2003 · Chemistry

Chargaff's rule states that in an organism

  • Correct answer
    A
    amount of adenine (A) is equal to that of thymine $(\mathrm{T})$ and the amount of guanine $(\mathrm{G})$ is equal to that of cytosine (C)
  • B
    amount of adenine (A) is equal to that of guanine (G) and the amount of thymine $(T)$ is equal to that of cytosine (C)
  • C
    amount of adenine (A) is equal to that of cytosine $(\mathrm{C})$ and the amount of thymine $(T)$ is equal to that of guanine (G)
  • D
    amounts of all bases are equal

Solution

Chargaff rule states that in DNA there is always equality in quantity between the bases $\mathrm{A}$ and $\mathrm{T}$ and between the bases $\mathrm{G}$ and $\mathrm{C}$. Related Theory In all the species the molar ratios $[A]=[T]$ and $[C]=[G]$, and that ratio $[C+G] /[A+T]$ was typically less than the unity with $[C+G]$ is less abundant.

Hence, the correct answer is option: 'A'.

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