Explore topic-wise MCQs in Biochemistry.

This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

What is the general mechanism of an enzyme?

A. It acts by reducing the activation energy
B. It acts by increasing the activation energy
C. It acts by decreasing the pH
D. It acts by increasing the pH
Answer» B. It acts by increasing the activation energy
Discussion
2.

The catalytic efficiency of two distinct enzymes can be compared based on which of the following factor?

A. K<sub>m</sub>
B. Product formation
C. Size of the enzymes
D. pH of optimum value
Answer» B. Product formation
Discussion
3.

Where does inhibitor binds on enzyme in mixed inhibition?

A. At active site
B. Allosteric site
C. Does not bind on enzyme
D. Binds on substrate
Answer» C. Does not bind on enzyme
Discussion
4.

Which of the following is an example of reversible inhibitor?

A. DIPF
B. Penicillin
C. Iodoacetamide
D. Protease inhibitors
Answer» E.
Discussion
5.

The molecule which acts directly on an enzyme to lower its catalytic rate is __________

A. Repressor
B. Inhibitor
C. Modulator
D. Regulator
Answer» C. Modulator
Discussion
6.

The rate determining step of Michaelis-Menten kinetics is __________

A. The complex dissociation step to produce products
B. The complex formation step
C. The product formation step
D. None of the mentioned
Answer» B. The complex formation step
Discussion
7.

Which of the following statements is true about uncompetitive inhibitors?

A. They bind covalently at a site distinct from the substrate active site
B. In the presence of a uncompetitive inhibitor, the Michaelis-Menten equation becomes
C. n (V_0 = frac{V_{max} [S]}{K_m+ [S]} )
D. They increase the measured V<sub>max u2061</sub>
E. Apparent K<sub>m</sub> also increases
Answer» C. n (V_0 = frac{V_{max} [S]}{K_m+ [S]} )
Discussion
8.

Which of the following statements is true about competitive inhibitors?

A. It is a common type of irreversible inhibition
B. In the presence of a competitive inhibitor, the Michaelis-Menten equation becomes
C. n (V_0 = frac{V_{max} [S]}{ K_m+[S]} )
D. The apparent K<sub>m</sub> decreases in the presence of inhibitor by a factor
E. The maximum velocity for the reaction decreases in the presence of a competitive inhibitor
Answer» C. n (V_0 = frac{V_{max} [S]}{ K_m+[S]} )
Discussion
9.

Which of the following is the correct Line weaver-Burk equation?

A. ( frac{1}{V_0} = frac{K_m}{V_{max} [S]} + frac{1}{V_{max}} )
B. ( frac{1}{V_{max}} = frac{K_m}{V_0 [S]} + frac{1}{V_0} )
C. (V_0 = frac{V_{max} [S]}{K_m+[S]} )
D. (V_{max} = frac{V_0 u2061 [S]}{K_m+[S]} )
Answer» B. ( frac{1}{V_{max}} = frac{K_m}{V_0 [S]} + frac{1}{V_0} )
Discussion