Question

The figure given below shows three velocity substrate concentration curves for an enzyme reaction. What do the curves A, B, and C depict respectively?

• A. A-normal enzyme reaction
  B-competitive inhibition
  C-non-competitive inhibition
• B. A-enzyme with an allosteric modulator added
  B-normal enzyme activity
  C-competitive inhibition
  
• C. A-enzyme with an allosteric stimulator
  B-competitive inhibitor added
  C-normal enzyme reaction
• D. A-normal enzyme reaction
  B-non-competitive inhibitoradded
  C-allosteric in hibitor added

Answer 1

The correct option is A A-normal enzyme reaction

B-competitive inhibition
C-non-competitive inhibition
In the given figure, curve A shows normal enzyme reaction, while curve B shows a competitive inhibition reaction, in which competitive inhibitors that resemble the substrate molecules, bind to the active site of the enzyme, whereas, curve C shows non-competitive inhibition reaction, in which the inhibitor binds to a part of the enzyme or enzyme substrate complex, other than the active site, known as the allosteric site.