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ENZYMES
1-
2-
Enzymes lower the activation energy of reactions.
• Substrate:
• Enzymes are specific.
• Active site:
.
How does an enzyme work?
Enzymes + substrate ES Enzyme + product
What does rate of reaction mean?
How is rate of reaction measured?
A + B C + Enzyme
Is this reaction a synthesis reaction or breaking down reaction?
Enzyme
Structure of enzymes:
• Simple enzymes:
Complex enzymes:
1- proetein part +
(apoenzyme)Inorganic part(cofactor)
Active enzyme
2- proetein part +(apoenzyme)
organic part(coenzyme)
Active enzyme
Naming enzymes• ------------ ase , e.g:
• What is the substarate of lipase?• What kind of reaction is catayist by DNA
polymerase? • How about pepsin, amylase?
Factors that affect enzymatic activity
1- Temperature:
What is the optimum temperature of a human body enzyme?
How does low temperature affect enzymatic activity?
How does high temperature affect enzymatic activity?
2- pH changes
What is the optimum pH of pepsin?
What would happen if you put an enzyme in acidic medium?
What would happen if an enzyme is put in a basic solution?
3- Substrate concentration
Describe how does substrate concentration affect rate of reaction?
4- Enzyme concentration
How does enzyme concentration affect enzymetic activity?
How is enzyme concentration increased?
5- Inhibitor HLInhibitors are the chemicals which bind active site of an enzyme. Eg: cyanade?
Graph? Enzyme inhibitor