MHT CET · BIOLOGY · STD 11 - 6. Biomolecules

Erwin Chargaff (1950) estimated that_______.

A A +T / G + C ratio in a DNA molecule remains constant for a particular species.
B pyrimidines and purines always occur in unequal proportion.
C nitrogen bases are placed regularly along the DNA molecule at a distance of 34°C.
D purine and pyrimidine bases are linked by glycosidic bond.

Verified Solution

Answer & Solution

Correct Answer

(A) A +T / G + C ratio in a DNA molecule remains constant for a particular species.

Step-by-step Solution

Detailed explanation

Erwin Chargaff also observed that the pyrimidines and purines always occur in equal proportion in DNA.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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