Enzymes and Kinetics – Section 1

21. An enzyme and a reactant molecule maintain a 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. a temporary association

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

A. 0.115
B. 0.42
C. 0.093
D. 6.693

Correct Answer: A. 0.115

23. 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: D. all of these

24. 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: C. Pseudo steady state

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

A. Carboxypeptidase A
B. Phosphorylase B kinase
C. Tyrosine hydroxylase
D. Phosphodiesterase

Correct Answer: A. Carboxypeptidase A

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