What is the catalytic cycle of an enzyme?

Question

Biology Introduction to metabolism need help :P

Answer 1

http://scholar.hw.ac.uk/site/biology/act... -  has an interactive explanation.

E + S -->E-S -->E +Products, E + S-->E-S --> E + Products  and so on.

Enzyme + substrate  gives an enzyme - substrate  complex and then free enzyme + products.The enzyme now repeats this cycle again and again.

Answer 2

The man characteristic of an enzyme is that enzyme lives reaction without change (after reacting with one reactant) and can be used as catalizator for another! Enzymes can make activation energy (energy that is necessary for reaction) lower and, in that way, make reaction faster!