enzymes n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Enzymes PowerPoint Presentation
Download Presentation
Enzymes

Loading in 2 Seconds...

play fullscreen
1 / 9

Enzymes - PowerPoint PPT Presentation


  • 94 Views
  • Uploaded on

Enzymes. Target #13- I can describe an enzyme. Reactions, like those in photosynthesis are a part of a metabolic pathway, a series of linked reactions Enzymes are a type of protein that functions to speed up chemical reactions Ex: Rubisco from the Calvin Cycle Are also known as a catalyst

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

Enzymes


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
target 13 i can describe an enzyme
Target #13- I can describe an enzyme
  • Reactions, like those in photosynthesis are a part of a metabolic pathway, a series of linked reactions
  • Enzymes are a type of protein that functions to speed up chemical reactions
    • Ex: Rubisco from the Calvin Cycle
    • Are also known as a catalyst
      • Contributes to the rate of the reaction, but is not a reactant or product
target 14 i can explain activation energy
Target #14- I can explain Activation energy
  • Some energy must be absorbed by the reactants in any chemical reaction
    • Activation Energy: the amount of energy that needs to be absorbed for a chemical reaction to start
target 15 i can describe the pieces associated with enzyme activity

Active Site: the surface depressions where the enzyme and substrate connects

  • Substrate: the molecule on which the enzyme acts
    • Has to fit into the active site of the enzyme
    • Temporarily bind to enzymes at specific places called activate sites
    • Like a lock-and-key
Target #15- I can describe the Pieces associated with enzyme activity
target 16 i can differentiate between the two models describing enzyme activity
Target #16- I can differentiate between the two models describing enzyme activity
  • Induced-Fit Model
    • Binding to a substrate may cause the enzyme to change shape slightly in order to fit
      • Each enzyme’s active site is shaped so that only a certain substrate molecule will fit
  • Lock-and-Key Model
    • Substrates exactly fit the active site of their corresponding enzyme
    • Enzymes bring substrate molecules close together
    • Enzymes decrease the activation energy needed and a chemical reaction can occur
target 17 i can explain the factors that affect enzyme activity
Target #17- I can explain the factors that affect enzyme activity
  • The rate of enzymatic activity is dependent upon several factors
    • Substrate concentration
      • Generally, the higher the amount of substrate, the higher the rate of activity
        • Has a maximum rate of productivity
    • Temperature & pH
      • As the temperature rises, so does the rate of enzymatic activity
        • Has a maximum rate of productivity
      • Rate of enzyme activity decreases eventually due to the enzyme becoming denatured
        • Causes the enzyme to change shape, and no longer functions
      • Perferred pH varies according to the enzyme
        • Most require a neutral pH
target 17 cont

Enzyme activation

    • Not all enzymes are needed at all times
    • Can be activated by adding or removing phosphates, or by adding or removing parts of the protein
  • Enzyme Inhibition
    • Occurs when the substrate is unable to bind to the active site of an enzyme
      • Activity is regulated by feedback inhibition
      • As the products of the reactions are used up, enzyme activity increases and inhibition decreases
  • Enzyme Cofactors
    • Some enzymes need an inorganic ion, like copper metal, called a cofactor
    • Some enzymes need an organic molecule, like vitamins, called a coenzyme
Target #17- cont.