NEET · Biology · STD 12 - 5. molecular basis of inheritance

The lactose present in the growth medium of bacteria is transported to the cell by the action of

A Acetylase
B Permease
C Polymerase
D Beta-galactosidase

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Answer & Solution

Correct Answer

(B) Permease

Step-by-step Solution

Detailed explanation

The \(y\) gene lac operon codes for permease enzyme, which increase the permeability of cell to \(\beta\)-galactosides. So, the lactose present in the growth medium of bacteria is transported into the cell by the action of permease.

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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Match List - I with List - II

List-I (Name of theVitamin)	List-II (Deficiency disease)
\(\text{A. Vitamin}\) \(\text B_{12}\)	\(\text{(I) Cheilosis}\)
\(\text{B. Vitamin D}\)	\(\text{(II) Convulsions}\)
\(\text{C. Vitamin}\) \(\text B_2\)	\(\text{(III) Rickets}\)
\(\text{D. Vitamin}\) \(\text B_6\)	\(\text{(IV) Pernicious anaemia}\)

Choose the correct answer from the options given below:

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