KCET · BIOLOGY · STD 12 - 5. Molecular Basis of Inheritance

The Lac-Operon model was clucidated by

A Jacob and Crick
B Watson and Crick
C Francois Jacob and Jaques Monad
D Hershey and Chase

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Answer & Solution

Correct Answer

(C) Francois Jacob and Jaques Monad

Step-by-step Solution

Detailed explanation

(C) Francois Jacob and Jaques Monad,
The lac operon is a cluster of genes through which Escherichia coli catabolizes lactose. It was first proposed by F. Jacob and J. Monod, who were also awarded the Nobel Prize in Physiology or Medicine in 1965.

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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