Some properties of enzymes are listed in column X, and their kinetic expressions are listed in column Y. Column X Enzyme properties Column Y Expressions A. Specific activity I. / B. Turnover number II. Substrate concentration at which v = max C. Michaelis constant III. / moles of enzyme D. Catalytic efficiency IV. / protein concentration Which one of the following options represents all correct matches between Column X and Column Y?

Correct option is C

Let's analyze the given table and match the enzyme properties in Column X with their corresponding kinetic expressions in Column Y.

Specific Activity (A)
- Specific activity is defined as $V_{\max}$ per unit of protein concentration.
- This corresponds to Option (iv): $concentrationV_{\max} / \text{protein concentration}$ .
Turnover Number (B)
- The turnover number ( $kcatk_{\text{cat}}$ ) represents the number of substrate molecules converted to product per enzyme molecule per second.
- This corresponds to Option (iii): $V_{\max}$ / moles of enzyme.
Michaelis Constant (C)
- The Michaelis constant ( $K_m$ ) is the substrate concentration at which the reaction velocity is half of the maximum velocity ( $V_{\max}$ ).
- This corresponds to Option (ii): $v = (V_{\max}/2)$ .
Catalytic Efficiency (D)
- Catalytic efficiency is represented by the ratio $kcat/Kmk_{\text{cat}} / K_m$ , which measures how efficiently an enzyme converts substrate to product.
- This corresponds to Option (i): $kcat/Kmk_{\text{cat}} / K_m$ .

This matches with Option 3.

Column X Enzyme properties		Column Y Expressions
A.	Specific activity	I.	/
B.	Turnover number	II.	Substrate concentration at which v =
C.	Michaelis constant	III.	/ moles of enzyme
D.	Catalytic efficiency	IV.	/ protein concentration