In feedback inhibition of a metabolic pathway
Correct answer: A. the final product inhibits an enzyme acting early in the pathway
- A. the final product inhibits an enzyme acting early in the pathway
- B. the first substrate inhibits the last enzyme
- C. the enzyme is destroyed after each reaction
- D. the pathway runs faster as product accumulates
Explanation
When enough product has been made it binds an allosteric site on an early enzyme and switches it off, so the cell stops spending resources on something it already has, and production restarts when the product is used up. This is negative feedback applied to metabolism and is the standard way biosynthetic pathways are regulated. Inhibiting an early step also prevents intermediates from piling up.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Enzyme Inhibitors
Enzyme inhibitors reduce reaction rate by interfering with enzyme-substrate interaction or catalytic activity. Coverage includes reversible competitive, non-competitive and uncompetitive inhibition, the effects of inhibitor concentration on reaction rate, and why competitive inhibition can be reduced by increasing substrate concentration.
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 Enzyme Inhibitors questions
Heavy metal ions such as mercury and silver inhibit many enzymes irreversibly because they
Malonate inhibits succinate dehydrogenase because it resembles succinate. This is an example of
Increasing the substrate concentration will NOT relieve the effect of
An allosteric site on an enzyme is
Compared with the uninhibited enzyme, a non competitive inhibitor
Competitive inhibitors