Biological catalysts are protein molecules which1. speed up a chemical reaction.2. remain unchanged after the reaction.3. function optimally at 37°C.4. do not have enzymatic activity.Select the correct answer using the code given below.

Biological catalysts are protein molecules which1. speed up a chemical

1.	Biological catalysts are protein molecules which1. speed up a chemical reaction.2. remain unchanged after the reaction.3. function optimally at 37°C.4. do not have enzymatic activity.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