(b) Enzyme models

(1) Draw the lock & key model of enzyme activity. Write a few sentences to explain this.

(2) Write 4-5 really good sentences to describe this process.

(3) How does the induced fit model of enzyme activity differ from the lock & key model? (You need to think for yourselves for this one)

external image enzyme5.gif

The active site on the enzyme attaches to a substrate molecule (such as a disaccharide) forming an enzyme-substrate complex. While attached to the substrate, the enzyme causes a weakening of certain chemical bonds in the substrate molecule, resulting in a breakdown (hydrolysis) of the substrate into two smaller product molecules (such as two monosaccharides). The enzyme is unaltered during the reaction and is free to catalyze the breakdown of another substrate molecule