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

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 K_m 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

23. The plot commonly used for determining the value of V_max is

A. Lineweaver Burk plot
B. Langmuir plot
C. Eadie Hofstee plot
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

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

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