In lac operon, \(z\) gene codes for:

A \(\beta\)-galactosidase
B Permease
C Repressor
D Transacetylase

Verified Solution

Answer & Solution

Correct Answer

(A) \(\beta\)-galactosidase

Step-by-step Solution

Detailed explanation

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 NEET

Column \(- I\) gives certain physical terms associated with flow of current through a metallic conductor. Column \(- II\) gives some mathematical relations involving electrical quantities. Match Column \(- I\) and Column \(- II\) with appropriate relations.

Column \(- I\)	Column \(- II\)
\((A)\) Drift Velocity	\((P)\) \(\frac{m}{n e^{2} \rho}\)
\((B)\) Electrical Resistivity	\((Q)\) \(\mathrm{ne} v_{\mathrm{d}}\)
\((C)\) Relaxation Period	\((R)\) \(\frac{\mathrm{eE}}{\mathrm{m}} \tau\)
\((D)\) Current Density	\((S)\) \(\frac{E}{J}\)

NEET 2021 Medium

Match List I with List II related to muscular/skeletal system :

List I	List II
A. Tetany	I. Inflammation of joints
B. Arthritis	II. Autoimmune disorder affecting neuromuscular junction
C. Myasthenia gravis	III. Wild contraction in muscle due to low \(Ca ^{++}\)in body fluid
D. Muscular dystrophy	IV. Progressive degeneration of skeletal muscle

Choose the correct answer from the options given below :

NEET 2026 Easy

Blood pressure in the pulmonary artery is

NEET 2016 Medium

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