#22 Summary of Enzymes

1  Enzymes are globular proteins which catalyse metabolic reactions.
2  Each enzyme has an active site with a specific shape, into which the substrate molecule or molecules fit precisely. This is the lock and key hypothesis – the substrate is compared with a key which fits precisely into the lock of the enzyme.

# 21 Michaelis - Menten Equation and Immobilising an enzyme

Michaelis-Menten equation describes the velocity of enzymatic reactions (v) by relating it to [S] - concentration of a substrate S.

#20.Factors affecting the rate of enzyme-catalysed reactions

These factors are:
- Temperature
- pH
- Enzyme concentration
- Substrate concentration 
- Inhibitor concentration

#19. Following the course of an enzyme-catalysed reaction

Measurement of the rate of formation of the product or the rate of disappearance of the substrate.

#18. Enzymes - active site, activation energy, enzyme specificity

Enzymes are globular proteins that serve as biological catalysts. 

They speed up or slow down metabolic reaction, but remain unchanged.

They may facilitate the breaking of an existing bond or the formation of a new bond.

#17.2 Enzymes - Syllabus 2016 - 2018

3.1    Mode of action of enzymes
3.2    Factors that affect enzyme action

#17.1 Enzymes - Syllabus 2015

• Mode of action of enzymes
• Factors that affect enzyme action