Question

11. Bacteria can produce approximately _____________ different enzymes
A. 250
B. 2,500
C. 25,000
D. 250,000

12. The first enzyme to be purified was
A. an oxidoreductase
B. a transferase
C. a hydrolase
D. a ligase

13. The scientist known for this first purification of an enzyme was
A. Pasteur
B. Sumner
C. Lehninger
D. Koshland

14. The initial step in enzyme catalysis requires
A. a redistribution of electrons
B. a transfer of protons
C. recognition of substrate by the enzyme
D. stresses and strains on chemical bonds

15. Enzymes that are responsible for electron transfers are
A. electrolases
B. hydrolases
C. oxidoreductases
D. ureases

Answer 1

Urease was the first enzyme to be purified and crystallised by James B. Sumner in 1926. Also, Urease belongs to hydrolase class.

QUESTION 12: correct option is (c) a hydrolase

QUESTION 13: correct option is (B) Sumner

QUESTION 15: Enzyme which is responsible for electron transfer are hydrogenases. Hydrolases are biochemical catalyst, hydrolytic enzymes that catalyses the reversible oxidation of hydrogen to protons with the loss of electrons.

Correct option is (B) hydrolases