Starter H202 is a cytotoxic agent which can be present in beverages such as instant coffees, inhaled gases and medicines.

H2O2 level should be minimized by the action of antioxidant defense enzymes, which is a network of enzymes work together to prevent damages to DNA, proteins and lipids.

The following are the questions you need to answer to investigate enzymes and enzymes actions. 1- General definition of : enzyme, substrate, active site.( You may draw a schematic picture with labels too) 2- What gives the specificity of enzymes. 3- Mechanism of enzyme: Lock and key model vs. inducible fit model. 4- What factors affect the rate (speed) of action of an enzyme? You have three ways to find out the answers: Text - diagram - Video

Think out side the box Go to “ Enzyme at work “ and choose three out of five questions to research and discuss.

Inhibition of enzyme activity Differentiate between competitive and non-competitive inhibition using text, diagram and video.