At equilibrium, a scientist added more substrate and observed an increase in the rate of the reaction, which soon declined. He added some more substrate, but this time the rate of the reaction remained unaffected. What was the reason?
Correct answer: B. Feedback due to the accumulation of the end product
- A. Enzyme did not function
- B. Feedback due to the accumulation of the end product
- C. Enzyme was more than substrate's active sites
- D. substrate did not function
Explanation
The addition of more substrate initially increased the rate of the reaction. However, as the reaction progressed, the products of the reaction may have accumulated and triggered a feedback mechanism that inhibited the reaction, maintaining it at a steady rate. This mechanism is called feedback inhibition. "Feedback inhibition is a process in which the reaction is controlled by the end product."Hence, option B is correct.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Enzymes
Enzymes are biological catalysts that lower activation energy without being consumed, and their specificity is explained by the lock and key and induced fit models. Work includes the effects of temperature, pH and substrate concentration on reaction rate, plus competitive and non-competitive inhibition and how these differ.
Practise Enzymes
633 free Enzymes MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Enzymes questions
Which factor is responsible for the inhibition of the enzymatic process during feedback?
What is common in both competitive and non-competitive inhibition?
Enzymes that require an optimum temperature lower than 37°C for their proper function are present in:
Penicillin blocks the active sites of an enzyme that many bacteria use in making cell walls. It is an example of:
A chemical substance that can react with an enzyme faster than a real substrate and without producing a product is
The Lock and Key Model for enzyme action proposed by Emil Fischer suggests that: