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Enzymes And Kinetics Online Exam Quiz

Important questions about Enzymes And Kinetics. Enzymes And Kinetics MCQ questions with answers. Enzymes And Kinetics exam questions and answers for students and interviews.

1. Which of the following common drugs is not a specific enzyme inhibitor?

Options

A : Iodine

B : Methotrexate

C : Sulfbnilamide

D : Penicillin

2. Which of the following statements is not true?

Options

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

3. Which of the following statements is true for enzymatically catalyzed reaction?

Options

A : The activation energy of the reaction is lowered so that a larger proportion of the substrate qualifies to overcome it

B : Additional substrate molecules are energized to overcome the activation energy of the reaction

C : The activation energy of the reaction is increased, thus decreasing the likelihood that any substrate molecules will overcome it

D : The activation energy of the reaction is lowered so that a fewer substrate molecules can overcome it

4. The conformational change in an enzyme after the substrate is bound that allows the chemical reaction to proceed, can be explained by

Options

A : induced fit

B : transition

C : fit and fine

D : Pasteur

5. A classical uncompetitive inhibitor is a compound that binds

Options

A : reversibly to the enzyme substrate complex yielding an inactive ESI complex

B : irreversibly to the enzyme substrate complex yielding an inactive ESI complex

C : reversibly to the enzyme substrate complex yielding an active ESI complex

D : irreversibly to the enzyme substrate complex yielding an active ESI complex

6. Which of these proteases is not a cysteine active site protease?

Options

A : Calpain

B : Cathepsin D

C : Papain

D : None of the above

7. A competitive inhibitor of an enzyme is usually

Options

A : a highly reactive compound

B : a metal ion such as Hg 2+ or Pb 2+

C : structurally similar to the substrate.

D : water insoluble

8. An enzyme is assayed at an initial substrate concentration of 2 x 10 -5 M. In 6 minute, half of the substrate is used. The K m for the substrate is 2 x 10 -3 M. The value of k in minute is

Options

A : 0.115

B : 0.42

C : 0.093

D : 6.693

9. An enzyme and a reactant molecule maintain relationship as

Options

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

10. Linear inhibition is sometimes called as

Options

A : complete inhibition

B : incomplete inhibtion

C : partial inhibition

D : mixed inhibition

1. The rate-determining step of Michaelis Menten kinetics is

Options

A : the complex formation step

B : the complex dissociation step to produce product

C : the product formation step

D : Both (a)and(c)

2. The active site of an enzyme remains

Options

A : at the center of globular proteins

B : rigid and does not change shape

C : complementary to the rest of the molecule

D : none of the above

3. In a Lineweaver-Burk Plot, competitive inhibitor shows which of the following effect?

Options

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

4. The enzyme inhibition can occur by

Options

A : reversible inhibitors

B : irreversible inhibitors

C : Both (a) and (b)

D : None of these

5. Which graphical method is used to determine an enzyme degree of cooperativity?

Options

A : Hill plot

B : Koshland curve

C : Michaelis-Menten hyperbola

D : Can not be determined

6. Which of these enzymes contains a Zinc (Zn) ion?

Options

A : Carboxypeptidase A

B : Phosphorylase B kinase

C : Tyrosine hydroxylase

D : Phosphodiesterase

7. Non-competitive inhibitor of an enzyme catalyzed reaction

Options

A : decreases V max

B : binds to Michaelis complex (ES)

C : both (a) and (b)

D : can actually increase reaction velocity in rare cases

8. The effect of non-competitive inhibition on a Lineweaver-Burk Plot is that

Options

A : it can move the entire curve to the right

B : it can change the y-intercept

C : it can change the x-intercept

D : all of these

9. Which category of enzymes belongs to class two in the international classification?

Options

A : Hydrolases

B : Ligases

C : Transferases

D : Isomerase

10. Given an enzyme with a K m = 10m M and V max = 100 m mol/min. If [S] = 100 m M, which of the following will be true?

Options

A : A 10 fold increase in V max would increase velocity 10 fold y

B : A 10 fold decrease in K m would increase velocity

C : Both (a) and (b)

D : A 10 fold increase in V max would decrease velocity 20 fold

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