NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Biology
- Chapter
- Chapter
NEET 2026 · Biology · Chapter
Regarding the mechanism of competitive inhibition of an enzyme,...
Regarding the mechanism of competitive inhibition of an enzyme, arrange the following events in the correct logical sequence of cause and effect :
A. The inhibitor competes with the substrate for the substrate-binding site.
B. Decline in the overall enzyme action.
C. Introduction of an inhibitor that closely resembles the substrate in molecular structure.
D. The normal substrate is prevented from binding to the enzyme.
E. The inhibitor binds to the active site of the enzyme.
Choose the correct answer from the options given below :
A. The inhibitor competes with the substrate for the substrate-binding site.
B. Decline in the overall enzyme action.
C. Introduction of an inhibitor that closely resembles the substrate in molecular structure.
D. The normal substrate is prevented from binding to the enzyme.
E. The inhibitor binds to the active site of the enzyme.
Choose the correct answer from the options given below :
Options
- A
- B
- C
- D
Correct answer
A.
Step-by-step solution
In competitive inhibition, the inhibitor closely resembles the substrate in its molecular structure.
First, the inhibitor is introduced into the system (C).
Due to its structural similarity, the inhibitor competes with the normal substrate for the substrate-binding site (A).
As a result of this competition, the inhibitor binds to the active site of the enzyme (E).
This binding physically blocks the active site, preventing the normal substrate from binding to the enzyme (D).
Consequently, the rate of the enzyme-catalyzed reaction decreases, leading to a decline in overall enzyme action (B).
The correct logical sequence is C, A, E, D, B.
Answer:
First, the inhibitor is introduced into the system (C).
Due to its structural similarity, the inhibitor competes with the normal substrate for the substrate-binding site (A).
As a result of this competition, the inhibitor binds to the active site of the enzyme (E).
This binding physically blocks the active site, preventing the normal substrate from binding to the enzyme (D).
Consequently, the rate of the enzyme-catalyzed reaction decreases, leading to a decline in overall enzyme action (B).
The correct logical sequence is C, A, E, D, B.
Answer: