200 Best MCQs on Enzymes and kinetics- biochemical engineering
Q17). In a Lineweaver-Burk Plot, competitive inhibitor shows which of the following effect?
a).It moves the entire curve to right
b).It moves the entire curve to left
c).It changes the x-intercept
d).It has no effect on the slope
Correct Answer:
It changes the x-intercept
Explaination:
Q18). Which of the following statements is not true?
a).Enzymes are proteins that bind to specific substrates and increase the velocity of reactions involving those substrates
b).Enzymes function by overcoming the activation energy barrier of a reaction
c).Enzymes make thermodynamically favorable reactions to proceed; they cannot make unfavorable reactions to occur
d).Enzymes only function when they are in intact cells
Correct Answer:
Enzymes only function when they are in intact cells
Explaination:
Q19). Non-competitive inhibitor of an enzyme catalyzed reaction
a).decreases Vmax
b).binds to Michaelis complex (ES)
c).both (a) and (b)
d).can actually increase reaction velocity in rare cases
Correct Answer:
both (a) and (b)
Explaination:
Q20). An enzyme and a reactant molecule maintain relationship as
a).a temporary association
b).an association stabilized by a covalent bond
c).one in which the enzyme is changed permanently
d).non complementary binding
Correct Answer:
a temporary association
Explaination:
Q21). The plot commonly used for determining the value of Vmax is
a).Lineweaver Burk plot
b).Langmuir plot
c).Eadie Hofstee plot
d).all of these
Correct Answer:
all of these
Explaination:
Q22). Quasi steady state is also known as
a).Michaelis Menten approach
b).Briggs-Haldane approach
c).Pseudo steady state
d).all of the above
Correct Answer:
Pseudo steady state
Explaination:
Q23). Which of these enzymes contains a Zinc (Zn) ion?
a).Carboxypeptidase A
b).Phosphorylase B kinase
c).Tyrosine hydroxylase
d).Phosphodiesterase
Correct Answer:
Carboxypeptidase A
Explaination:
Q24). A noncompetitive inhibitor of an enzyme-catalyzed reaction
a).increases Km and increases Vmax
b).increases Km and reduces Vmax
c).reduces Km and increases Vmax
d).reduces Km and reduces Vmax
Correct Answer:
increases Km and reduces Vmax
Explaination: