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

In the lac-operon model, lactose molecules function as

A repressors which bind with the operator gene
B Inducers which bind with the operator gene
C Corepressors which bind with the repressor protein
D Inducers which bind with the repressor protein

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Answer & Solution

Correct Answer

(D) Inducers which bind with the repressor protein

Step-by-step Solution

Detailed explanation

(D) Inducers which bind with the repressor protein,
In lac open model, lactose work as inducer which binds with the repreuor protein, also that gene regulation is occur.

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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From KCET

Cupric Carbonate	% of Cu	% of C	% of O
Natural Sample	51.35	9.74	38.91
Synthetic Sample	51.35	9.74	38.91

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Column I	Column II
(A) Lactobacillus	(p) Butyric acid
(B) Aspergillus niger	(q) Acetic acid
(C) Asetobacter aceti	(r) Lactic acid
(D) Clostridium butylicum	(s) Citric acid