biochem 004 basic concepts on enzyme action part 1 (cofactor active site enzyme-substrate complex

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mikepl103
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284945
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biochem 004 basic concepts on enzyme action part 1 (cofactor active site enzyme-substrate complex
Updated:
2014-10-19 21:00:24
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biochem 004 basic concepts enzyme action part cofactor active site substrate complex michealis menten equation
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2014,biology,biochem
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biochem 004 basic concepts on enzyme action part 1 (cofactor, active site, enzyme-substrate complex, michealis-menten equation) #7
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  1. what are the six major classes of enzymes?
    • 1. oxidoreductases 
    • 2. transferases 
    • 3. Hydrolases
    • 4. lysases
    • 5. isomerases
    • 6. ligases
  2. what do oxidoreductases do?
    catalyze redox reactions
  3. what do transferases do?
    they transfer a functional group from one molecule to another
  4. what do hydrolyases do?
    the break down bonds in the presence of water
  5. what do lysases do?
    they remove/add atoms to make double bonds
  6. what do isomeraes do?
    they move functional groups within a molecule
  7. what do ligases do?
    they join two molecules @ the expense of ATP
  8. an enzyme without its cofactor is referred to as
    apoenzyme
  9. the complete, catalytically active enzyme is called a
    holoenzyme
  10. the catalytic activity of many enzymes depends on the presence of small molecules termed...
    cofactors
  11. what are the two types of cofactors?
    • 1. small organic molecules, derived from vitamins, called coenzymes
    • 2. metals
  12. tightly bound coenzymes are called ____ _____
    prosthetic groups
  13. a reaction can take place spontaneously only when...
    the ΔG is negative
  14. what is the ΔG at equilibrium?
    0
  15. True or falsE? enzymes accelerate the attainment of equilibria and shift their positions.
    false. enzymes accelerate the attainment of equilibria BUT DO NOT shift their positions
  16. what accounts for the lowering of activation energy by an enzyme?
    free energy is released by the formation of a large number of weak interactions between a complementary enzyme and substrate. This release in free energy decreases the activation energy.

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