Engage Activity Describe the concept of a lock and key.

Chemical Reactions and Enzymes OBJ: Describe the structure and function of enzymes in reactions

Chemical Reactions Review Process that changes, or transforms one set of chemicals into another Reactants -> Products Reactions always involve changes in the chemical bonds that join the atoms into compounds

Chemical Reactions Review Process that changes, or transforms one set of chemicals into another

Energy in Reactions Energy is released when chemical bonds are broken and absorbed whenever chemical bonds formed. Activation energy: the energy that is needed to get a reaction started.

Energy in Reactions Energy is released when chemical bonds are broken and absorbed whenever chemical bonds formed. Activation energy: the energy that is needed to get a reaction started.

Enzymes Catalyst is a substance that speeds up the rate of chemical reactions by lowering activation energy Enzymes = biological catalysts that speed up reactions that take place in the cells

Enzymes What does the graph show would be the effect if enzymes were not available within a cell? Without enzymes, reactions would need more activation energy to get started

Enzymes What does the graph show would be the effect if enzymes were not available within a cell? Without enzymes, reactions would need more activation energy to get started

Enzymes Would a reaction take a longer or shorter time with an enzyme?

Enzymes Would a reaction take a longer or shorter time with an enzyme? A shorter time

Enzymes cont’d Enzymes are VERY specific

Enzyme-Substrate Complex Notice: Enzyme is NOT changed

Enzyme-Substrate Complex

Regulation of Enzyme Activity Can be affected by variables that influence a reaction (i.e. temperature, pH When an enzyme is denatured it is turned off

Enzymes and Digestion http://youtu.be/AFbPHlhI13g

Review: Engage Activity Which of these is like the enzyme and which is the substrate? Where is the active spot? How does inserting a key into a lock different from the formation of an enzyme-substrate complex?

Review: Engage Activity Which of these is like the enzyme and which is the substrate? Where is the active site? How does inserting a key into a lock different from the formation of an enzyme-substrate complex?

Review: Engage Activity Which of these is like the enzyme and which is the substrate? Where is the active spot? How does inserting a key into a lock different from the formation of an enzyme-substrate complex?