Question

1. enzymes speed chemical reactions by

a. lowering the amount of reactants that are needed.
b. maintaining temperature.
c. lowering the energy required to start a chemical reaction.
d. raising the temperature of the surroundings.
e. supplying energy to the reaction process.

1. enzymes

a. slow reactions so they occur correctly.
b. are not necessary to sustain life in a cell.
c. are not found in living organisms.
d. are proteins in most cases.
e. are carbohydrates in most cases.

1. the region of an enzyme that catalyzes reactions is called

a. an active site.
b. a binding pocket.
c. a reaction site.
d. a catalyst site.
e. an analog.

Explanation:

1. Enzymes are biological catalysts that lower the activation - energy, which is the energy required to start a chemical reaction, thus speeding up reactions.
2. Most enzymes are proteins. They are essential for life in cells and speed up reactions rather than slow them down.
3. The region of an enzyme that catalyzes reactions is called the active site. It is where the substrate binds and the reaction occurs.

Answer:

1. c. lowering the energy required to start a chemical reaction.
2. d. are proteins in most cases.
3. a. an active site.