BIOLOGY   102   ENZYMES   SB1.b. Explain how enzymes function as   catalysts.
What is an enzyme?   Also called a    biological catalyst   Protein that speeds    up the rate of a    reaction.   Not ...
Why are enzymes important?                                Green line is reaction without enzyme   Decreases the amount   ...
What would happen if we did nothave enzymes or they did notwork properly?   You would DIE!   No enzymes =    reactions h...
How does an Enzyme Work?   Each enzyme has a    specific shape which    causes it to bind with    specific reactantsParts...
How Does an Enzyme Work? Because  only SPECIFIC substrates will fit in SPECIFIC enzymes they are often compared to a LOCK...
How Does an Enzyme Work?      Enzymes work one of two       ways                                                         ...
What may alter enzyme    functioning?   pH, salt concentration,    temperature   All will DENATURE enzyme.   Changes it...
Can you answer these questions about the picture below? (Check answers on next page.)1.   What type of macromolecule is an...
Can you answer these questions about the picture below? ANSWERS1.   What type of macromolecule is an enzyme? Protein2.   W...
Can you answer these questions about thegraph below? (Check answers on next page.)This graphs shows how an enzyme      fun...
Can you answer these questions about the     graph below? ANSWERSThis graphs shows how an enzyme functions      at differe...
1.    Enzymes are compared to a lock & key because     a.   They open up cells and let stuff in     b.   They have very sp...
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102 enzymes 2010

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102 enzymes 2010

  1. 1. BIOLOGY 102 ENZYMES SB1.b. Explain how enzymes function as catalysts.
  2. 2. What is an enzyme? Also called a biological catalyst Protein that speeds up the rate of a reaction. Not changed during the reaction. Used over and over until the reactant is used up.
  3. 3. Why are enzymes important? Green line is reaction without enzyme Decreases the amount Red line is reaction WITH enzyme. of energy needed (activation energy) for a reaction to occur. As a result, the reaction happens faster.
  4. 4. What would happen if we did nothave enzymes or they did notwork properly? You would DIE! No enzymes = reactions happening too slowly so body can’t get what it needs to survive.
  5. 5. How does an Enzyme Work? Each enzyme has a specific shape which causes it to bind with specific reactantsParts of an Enzyme- Substrate Complex: Substrates- reactants that fit with enzyme Active site- site on enzyme that substrates bind to Products- created from combining of substrates. This is what leaves the enzyme
  6. 6. How Does an Enzyme Work? Because only SPECIFIC substrates will fit in SPECIFIC enzymes they are often compared to a LOCK & KEY MODEL
  7. 7. How Does an Enzyme Work?  Enzymes work one of two ways Two reactants bind together to make one product – Bind two reactants to make one product (see picture on right) – Break bonds in large molecule to make many smaller ones (see picture below)One reactant is broken apart to make two products. Orange structure is enzyme,green & blue parts in first part of picture are substrates.
  8. 8. What may alter enzyme functioning? pH, salt concentration, temperature All will DENATURE enzyme. Changes its shape so it no longer accepts substrates so can’t create products. This would slow down/stop reactions from happening in body. Great Website to show Enzyme activity
  9. 9. Can you answer these questions about the picture below? (Check answers on next page.)1. What type of macromolecule is an enzyme?2. What is another name for enzyme?3. What is the enzyme term for #2?4. What is the enzyme term for the site on the enzyme where the sucrose attaches?5. What is added at #3?6. What is the enzyme term for the glucose & fructose created at #4?7. Has the enzyme changed in this reaction?8. What types of factors could denature the enzyme?9. What will happen if the enzyme is denatured?
  10. 10. Can you answer these questions about the picture below? ANSWERS1. What type of macromolecule is an enzyme? Protein2. What is another name for enzyme? Catalyst3. What is the enzyme term for #2? Reactant or substrate4. What is the enzyme term for the site on the enzyme where the sucrose attaches? Active Site5. What is added at #3? Water (H2O)6. What is the enzyme term for the glucose & fructose created at #4? Products7. Has the enzyme changed in this reaction? No- has same shape so can be reused8. What types of factors could denature the enzyme? pH, temperature, salt9. What will happen if the enzyme is denatured? Active site is changed so reactants can no longer fit into enzyme so reaction can’t happen. This means you can no longer break down sucrose to get the glucose & fructose so cells can’t absorb these glucose & fructose molecules to use them. Cell may “starve” for these molecules.
  11. 11. Can you answer these questions about thegraph below? (Check answers on next page.)This graphs shows how an enzyme functions at different pH levels.1. This enzyme works best at which pH?2. Would you find this enzyme in your stomach or blood? How do you know?3. What would happen to the amount of product made if the pH rose to 13?
  12. 12. Can you answer these questions about the graph below? ANSWERSThis graphs shows how an enzyme functions at different pH levels.1. This enzyme works best at which pH? pH 72. Would you find this enzyme in your stomach or blood? Blood How do you know? Stomach has acidic environment so would need an enzyme that works best at an acidic pH level.3. What would happen to the amount of product made if the pH rose to 13? The amount of product would decrease b/c the enzyme does not work well at that pH.
  13. 13. 1. Enzymes are compared to a lock & key because a. They open up cells and let stuff in b. They have very specific active sites so can only participate in a specific reaction c. They destroy specific enzymes2. The structure labeled biological catalyst is a. a substrate b. an Enzyme c. a ribosome3. How does a lower temperature (refrigeration) affect the rate of enzyme activity? a. It speeds it up b. It slows it down c. It has no effect1. During the canning process, heat is used to destroy bacteria in food. How does this affect enzymes? a. They are not affected b. They are denatured c. They multiply1. What is the optimum pH for this enzyme? a. 3 b. 7 c. 14 6. Will this enzyme function any differently at a pH of 16? a. Yes b. no

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