Final answer:
Enzymes are protein molecules that act as biological catalysts to speed up biochemical reactions. They are highly specific and often require helper molecules to enhance their function.
Step-by-step explanation:
Enzymes are protein molecules that act as biological catalysts to speed up biochemical reactions by reducing the activation energy needed for the reaction to start. They are highly specific and typically work on one particular substance called the enzyme's substrate. Enzymes can form temporary or permanent bonds with other helper molecules, such as cofactors and coenzymes, to enhance their function.