Enzymes can accelerate reactions by.
1. Binding a substrate or substrates2. Lowering the energy for activation3. Correctly postioning a metal ion for catalysis4. Promoting the removal or addition of protons5. All of the above

Explanation:

Enzymes are called biological catalysts because they speed up the biochemical reactions. Most of the enzymes are made up of the protein and plays an important role in regulating the biochemical reactions of the organisms. All the metabolic reactions that may be anabolic or catabolic are regulated by the specific enzymes. Mostly they increase the rate of the biochemical reactions by lowering or decreasing the activation energy of the reactions.