why enzymes are responsible for catalysis?

Question

How enzymes react with substrate to form a product? what are its characteristics?

Pls. explain it briefly.. I need it for tomorrow... : )

Answer 1

I answered a similar question awhile ago, and it was voted as a best answer. I hope it will help you also.

My answer is reproduced below:
Best Answer - Chosen By Voters

Enzymes are predominantly composed of proteins; it may have glyco or sugar fractions, it may have metal complexes in them.

Enzymes act as catalysts. That means they speed up the biochemical reactions but are not used up in the process.

Enzymes have very complex 3-dimensional shapes or configurations.

Enzymes are very specific substances. They will selectively react with a particular substrate.

Enzymes are easily recognizable from the name. It usually ends in -ASE. For example, MALTase reacts with the sugar maltOSE

Enzymes react with substrates in such a way that the reacting groups within or among molecules are thermodynamically, sterically, and chemically are in the optimal position for an efficient creation of products. One model is like a "lock and key" although there are other models as well.