IGCSE BIO 5. enzymes

catalysts

substances that increase the rate of chemical reaction and are not changed by the reaction

enzymes

proteins that are biological catalysts, being involved in all metabolic reactions

substrate

substance on which the enzyme acts

active site

location on the enzyme to with the substrate attaches, having complementary shape for specific substrate

process of enzyme action

substrate fits into active site of enzyme → enzyme-substrate complex formed → shape of product changes, so released from enzyme

suffix for enzyme

-ase

factors that affect enzyme reactivity

temperature, pH, substrate concentration, enzyme concentration

enzymes are denatured when

too high temperature, extreme pH