enzymes catalysts

1
Catalysts

• speed up the rate of the reaction.

• lowers the energy input required for a chemical
  reaction to happen

• remains unchanged at the end of the reaction

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2
Enzymes

• Enzymes are Biological catalysts

• Enzymes control chemical reactions that take
  place in the cytoplasm.
• http//programs.northlandcollege.edu/biology/Biolo
  gy1111/animations/enzyme.html

• Catalase in an example of an enzyme made by
  living cells

3
Catalase

• The enzyme catalase breaks down the waste
  substance hydrogen peroxide into water and
  oxygen.

catalase
Hydrogen peroxide oxygen
water (enzyme)
(substrate)
(products)
4
Degradation reactions
animation
5
Synthesis Reaction
es
Active site
6
Degradation reactions
Starch
Maltose
7
Enzyme activity
Temperature and pH affect the activity of an
enzyme.
8
Optimum Condition

• Enzymes function best or are most active in
  specific conditions known as optimum
• conditions.

9
Degradation reaction
Substrate Enzyme Product Memory
Hydrogen peroxide Catalase Oxygen and water HPCOW
Starch Amylase Maltose
Maltose Maltase Glucose
Protein Pepsin Peptides
Peptides Protease Amino acids
Fats Lipase Fatty Acids and Glycerol
10
Synthesis reaction
Glucose-1-phosphate
Starch
11
Properties of enzymes
Speed up reactions.
Made of protein.
Are specific.
Not used up during the reaction.
Require optimum conditions at which they work
best.
At high temperature they become denatured
12
Lock and Key

• http//www.lewport.wnyric.org/jwanamaker/animation
  s/Enzyme20activity.html

13

Synthesis reactions
phosphorylase

• Glucose-1-phosphate Starch

(Substrate)
(enzyme)

• (product)