Enzymes

What is an enzyme?• Organic catalyst• Protein molecule

Speed up chemical reactions by lowering the activation energy

What is the function of an enzyme?

Activation Energy

• energy required to start all chemical reaction

• How can all reactions require energy, if some are considered exergonic/exothermic?

Induced-Fit Model

Factors that affect enzyme functioning

1. Temperature2. pH 3. Enzyme concentration4. Substrate concentration5. Cofactors/coenzymes6. inhibitors

Cofactors/Coenzymes

Feedback Inhibition

• End product controls action of enzyme• When end product binds to enzyme, there is a

change of shape and enzyme no longer functions