ENZYME.

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Presentation transcript:

ENZYME

Characteristics of enzymes Protein in nature. Biological catalysts. Speed up reactions without being changed or used up. Act on reversible reaction. Action of enzymes is specific Work best at a certain range of pH and temperature. Action of enzymes is affected by inhibitor

Characteristics of enzymes A + B C enzyme Biological catalyst Protein pH Specificity

substrate substrate enzyme active site

Action of enzyme (Anabolic reaction) enzyme-substrate complex enzyme-product complex enzyme product enzyme substrate

Action of enzyme (catabolic reaction) enzyme-product complex enzyme-substrate complex products enzyme enzyme substrate

Lock and key hypothesis Substrate product Enzyme

Lock and key hypothesis SHAPES DON’T MATCH

Factors affecting enzyme action Substrate concentration Max. Rate Rate of reaction Substrate conc.

Factors affecting enzyme action Substrate concentration

Factors affecting enzyme action Temperature Rate of reaction Temperature（OC） 0 10 20 30 40 50

Factors affecting enzyme action Temperature Each enzyme works best at a particular temperature - _____________________. When temperature is lower than optimum temperature, activity of enzyme become ________. At low temperature, enzymes become _____________. They become _________________ when the temperature is raised. optimum temperature lower inactive active again

Factors affecting enzyme action Temperature Above the optimum temperature, heat changes the _______ of enzymes and their _____________, __________ their activities. When temperature is too high (above 60oC), most enzymes are ____________, and lose they catalytic property permanently. shape active sites decreases denatured

Factors affecting enzyme action pH Rate of reaction pH

Application of Enzymes Washing Powder

SCIENCE SECTION CURRICULUM DEVELOPMENT INSTITUTE EDUCATION DEPARTMENT