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Enzymes. Enzymes are…. Catalysts is any substance that works to accelerate a chemical reaction Most enzymes are proteins. How do catalysts speed up reactions?. The activation energy in chemistry is the energy needed by a system to initiate a particular process

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Presentation Transcript
enzymes are
Enzymes are…
  • Catalysts
    • is any substance that works to accelerate a chemical reaction
  • Most enzymes are proteins
how do catalysts speed up reactions
How do catalysts speed up reactions?
  • The activation energy in chemistry is the energy needed by a system to initiate a particular process
  • Catalysts decrease activation energy
slide9
Substrate: substance that an enzyme reacts with
  • Active Site: part of the enzyme that reacts or binds to the substrate
enzymes are specific and complementary
Enzymes are specific and Complementary
  • Complementary: complement one another; shaped for precise pairing
  • Specific: particular, precise
    • Only the correct substrate can fit into the enzyme’s active site
enzymes end in ase
Enzymes end in -ase
  • Carbohydrase- breaks down carbohydrates into simple sugars
  • Amylase- breaks down starch
  • Protease – breaks down proteins into amino acids
  • Lipase- breaks down lipids into fatty acids and glycerol
temperature effects enzymes
Temperature effects enzymes
  • Increasing temperature increases enzyme activity until it reaches an optimum value
  • Increasing temperature past that point denatures the enzyme
denature
Denature
  • shape of the protein is altered through some form of external stress
  • will no longer be able to carry out its cellular function
ph effects enzymes
pH effects enzymes
  • Certain pH value causes optimal enzyme activity
  • Too low or too high pH will denature the enzyme
enzymes are reused or recycled
Enzymes are reused or recycled
  • In a written equation, enzymes appear on both the reactant and product side
  • Substrate + enzyme enzyme and products

reactants products

  • They are not used up
  • They are recycled and being used over and over gain
slide18
The function of most proteins depends primarily on the

(1) type and order of amino acids

(2) environment of the organism

(3) availability of starch molecules

(4) nutritional habits of the organism

slide19
Enzyme molecules normally interact with substrate molecules. Some medicines work by

blocking enzyme activity in pathogens. These

medicines are effective because they

(1) are the same size as the enzyme

(2) are the same size as the substrate molecules

(3) have a shape that fits into the enzyme

(4) have a shape that fits into all cell receptors

slide20
The diagram below represents two molecules that can interact with each other to cause a biochemical process to occur in a cell.

Molecules A and B most likely represent

(1) a protein and a chromosome

(2) a receptor and a substrate

(3) a carbohydrate and an amino acid

(4) an antibody and a hormone

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