Regarding catalytic cycle of an enzyme action, select the correct sequential steps :
A. Substrate enzyme complex formation.
B. Free enzyme ready to bind with another substrate.
C. Release of products.
D. Chemical bonds of the substrate broken.
E. Substrate binding to active site.
Choose the correct answer from the options given below :
- AE, A, D, C, B
- BA, E, B, D, C
- CB, A, C, D, E
- DE, D, C, B, A
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Correct answer: A
The correct order of the steps in the catalytic cycle of enzyme action involves the following key events:
- Substrate binding to the active site: Before any reaction can take place, the substrate must bind to the enzyme's active site. This is where the substrate is correctly positioned for the reaction.
- Formation of the substrate-enzyme complex: Once the substrate binds to the active site, a substrate-enzyme complex is formed. This complex stabilizes the transition state of the reaction and lowers the activation energy required for the reaction.
- Chemical bonds of the substrate broken : Within the substrate-enzyme complex, the specific chemical reaction occurs, leading to the breaking of bonds within the substrate. This step often involves changes to the chemical structure of the substrate, turning it into the product(s) of the reaction.
- Release of products: After the reaction occurs, the product(s) of the reaction are released from the enzyme, leaving the enzyme unchanged.
- Free enzyme ready to bind with another substrate: Once the product is released, the enzyme is free again to bind with another substrate, repeating the cycle.
Given the correct sequence and your provided options, the correct answer is:
Option A: E, A, D, C, B
This sequence correctly describes the steps involved in the catalytic cycle of enzyme action, from substrate binding to the release of products and the readiness of the enzyme to start a new cycle.
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