Question

Which description best fits for an enzyme that is most likely to be affected by a competitive inhibitor?

a. The binding curve exhibits a sigmoidal shape.

b. The enzyme contains three subunits of equal molecular weight and number of amino acids.

c. The enzyme displays binding characteristics that is most supported by the concerted model.

d. All three best describe an enzyme most likely affected by a competitive inhibitor.

e. None of these is correct.

Answer 1

Ans. All three best describe an enzyme most likely affected by a competitive inhibitor.

Explaination: There is competition for binding at active sites of the enzyme. Hence, binding by inhibitors follow a S-shaped curve. The effect of inhibitors can be reversed by adding more amount of substrates. There is no conformational change in the enzyme and the enzyme shows binding characteristics as in the normal condition as in concerted model and hence enzyme catalysis occurs to convert substrate into product except in less rate because the inhibitors occupy many active sites of enzymes in competition with the target substrate.