Question

which of the following is an example of a biological catalyst?
a. hydrogen gas
b. platinum
c. enzyme
d. carbon dioxide

Explanation:

Biological catalysts speed up biochemical reactions in living organisms. Enzymes are proteins that act as biological catalysts. Hydrogen gas, platinum, and carbon - dioxide are not biological catalysts. Hydrogen gas is a simple molecule, platinum is a metal used as an industrial catalyst in some non - biological reactions, and carbon dioxide is a common gas involved in various chemical and biological processes but not as a catalyst.

Answer:

C. Enzyme