Chemical Reactions and Enzymes Notes - PowerPoint PPT Presentation

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Chemical Reactions and Enzymes Notes

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Chemical Reactions and Enzymes Notes Objectives What happens to chemical bonds during chemical reactions? Explain the effect of a catalyst on activation energy. – PowerPoint PPT presentation

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Title: Chemical Reactions and Enzymes Notes


1
Chemical Reactions and Enzymes Notes
2
Objectives
  • What happens to chemical bonds during chemical
    reactions?
  • Explain the effect of a catalyst on activation
    energy.
  • Why are enzymes important to living things?

3
Vocabulary
  • Chemical reaction
  • Reactant
  • Product
  • Activation energy
  • Catalyst
  • Enzyme
  • Substrates

4
Chemical Reaction
  • A process that changes, or transforms, one set of
    chemicals into another.

5
Reactants
  • The elements or compounds that enter into a
    chemical reaction.

6
Products
  • The elements or compounds produced by a chemical
    reaction.

7
  • Chemical reactions always involve changes in the
    chemical bonds that join atoms in compounds.

8
Activation Energy
  • The energy that is needed to get a reaction
    started.

9
Catalyst
  • A substance that speeds up the rate of a chemical
    reaction.

10
Enzymes
  • Proteins that act as biological catalysts.

11
  • Enzymes speed up chemical reactions that take
    place in cells.

12
  • The micrograph shows a white blood cell engulfing
    an invading pathogen.
  • (Colored SEM magnification about 3000X)

The larger micrograph shows a pathogen after it
has been captured. Once inside a white blood
cell, enzymes are used to destroy the
pathogen. (Colored TEM magnification 11,000X)
13
Substrates
  • The specific reactants that an enzyme acts on.

14
  • Substrates bind to an enzyme at certain places
    called active sites.
  • The enzyme brings substrates together and weakens
    their bonds.
  • The catalyzed reaction forms a product that is
    released from the enzyme.

15
  • Enzymes are proteins that catalyze biochemical
    reactions. The activities of enzymes depend on
    the temperature, ionic conditions, and the pH of
    the surroundings.
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