| A | B |
|---|
| Lactose can be broken down into galactose and glucose by the enzyme known as ___. | lactase |
The most important quality of an enzyme is its ___., 
| shape. |
| A protein whose shape has been changed due to heat or harsh chemicals is known as a(n) ____ protein. | denatured |
| Organic catalysts are known as ___.,
| enzymes |
| An enzyme ____ a chemical reaction without being changed itself. | speeds up (this also applies to catalysts in general) |
| Enzymes are almost always made of ____.,
| proteins (although some enzymes are actually made of RNA) |
| The chemical or chemicals that an enzyme works on is called the ___.,
| substrate |
| The part of the enzyme that the substrate fits into is called the ___. | active site |
| The chemical process in which molecules are broken down in the body is known as ___. | catabolism,
|
| The chemical process in which larger molecules are built up is known as ___. | anabolism,
|
| The sum of all catabolic and anabolic reactions in the body is known as ___. | metabolism,
|
| Five things that can affect how well an enzyme works are ___.,
| temperature, concentration, pH, inhibitors, and mutations in the DNA that codes for the enzyme |
| A(n) _____ is any substance that speeds up a chemical reaction without being used up. | catalyst |
What does "A" in this graph represent?,  | Energy of activation without an enzyme present, |
| What does "B" in this graph represent?, | The lowered energy of activation due to an enzyme being present, |
The letter "A" represents a(n) ____ for this enzyme.,  | active site, |
| The letter "B" represents a(n) ____., | enzyme, |
| The letter "C" represents a(n) ____., | substrate, |
The molecules labeled "A" are known as the _____.,  | reactants, |
| The molecules labeled "C" are known as the _____., | products, |
| This graph shows how potential energy changes over the course of an _____ chemical reaction., | exothermic, |
| The difference in energy between A and B is called the ____., | activation energy (a.k.a. energy of activation), |
| The reactant on which an enzyme works is called the _____. | substrate |
| The amount of energy that reactants must absorb before a chemical reaction will start is called the ____. | activation energy |
| True or False: Breaking bonds releases energy. | False (Breaking bonds always requires energy. The formation of bonds releases energy) |
