Biological catalysts are protein molecules which_x005F_x000D_ 1. speed up a chemical reaction_x005F_x000D_ 2. remain unchanged after reaction_x005F_x000D_ 3. function optimally at 37 deg C._x005F_x000D_ 4. do not have an enzymatic activity_x005F_x000D_ Select the correct answer using the code given below.

Biological catalysts are protein molecules which_x005F_x000D_ 1. speed

1.	Biological catalysts are protein molecules which_x005F_x000D_ 1. speed up a chemical reaction_x005F_x000D_ 2. remain unchanged after reaction_x005F_x000D_ 3. function optimally at 37 deg C._x005F_x000D_ 4. do not have an enzymatic activity_x005F_x000D_ Select the correct answer using the code given below.
A.	1 only
B.	1, 2 and 3
C.	2 and 3 only
D.	1, 3 and 4
Answer» C. 2 and 3 only