Biological catalysts are protein molecules which 1. speed up a chemical reaction 2. remain unchanged after reaction 3. function optimally at 37°C 4. do not have an enzymatic activity Select the correct answer using the code given below.

CDS 2016 PYQ with Answer — Biological catalysts are protein molecules which 1. speed up a chemic…

2016 · Q24

Biological catalysts are protein molecules which

1speed up a chemical reaction
2remain unchanged after reaction
3function optimally at 37°C
4do not have an enzymatic activity

Select the correct answer using the code given below.

General KnowledgeBiology

A1 only
B1, 2 and 3
C2 and 3 only
D1, 3 and 4

Explanation

Enzymes — the biological catalysts, which are protein molecules — speed up reactions (1) and emerge unchanged (2), and human enzymes typically work best near body temperature, 37 °C (3). Statement 4 is self-contradictory: biological catalysts are by definition enzymes, so they cannot "not have enzymatic activity." Hence 1, 2 and 3.