(B) Erwin Chargaff observed that the amount of purines $(A + G)$ is always equal to the amount of pyrimidines $(T + C)$ in a double-stranded $DNA$ mol

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pyrimidines and purines always occur in equal proportion.

(B) Erwin Chargaff observed that the amount of purines $(A + G)$ is always equal to the amount of pyrimidines $(T + C)$ in a double-stranded $DNA$ molecule.This is known as Chargaff's rule, which states that the ratio of adenine to thymine is $1:1$ and the ratio of guanine to cytosine is $1:1$.

Class 12 Biology Molecular Basis of Inheritance The DNA

Easy

Erwin Chargaff $(1950)$ estimated that . . . . . . .

MHT CET 2023 All MHT CET

A
$\frac{A + T}{G + C}$ ratio in a $DNA$ molecule remains constant for a particular species.
B
pyrimidines and purines always occur in equal proportion.
C
nitrogen bases are placed regularly along the $DNA$ molecule at a distance of $3.4 \ \text{Å}$.
D
purine and pyrimidine bases are linked by glycosidic bond.