Enzymes

___ are the elements and compounds that are created by a reaction.

• Products

• Reactants

• Molecules

• Ingredients

The energy needed to start a reaction is called the

• activation energy

• starting energy

• promoting energy

• reacting energy

Enzymes contain a(n) ___ where reactants can bond to react with each other.

• active site

• reaction site

• substrate site

• enzyme site

Once an enzyme has helped a reaction take place, it can then

• be reused for another reaction with the same reactants.

• be broken down.

• be stored in the cell until it is needed again.

• be used to help different reactants go through a reaction.

Compare the two pathways, which pathway shows the reaction that has taken place with the help of an enzyme?

• Pathway 1

• Pathway 2

• You cannot tell from these graphs.

• Both reactions involved an enzyme.

At the end of this reaction, has energy been released or absorbed?

• Absorbed

• Released

• There is not enough information to tell.

• There is not change in the amount of energy in the system.

An enzyme is a 

• Protein
• Carbohydrate
• Lipid
• Nucleic Acid

What will most likely happen if an appropriate enzyme is added to a chemical reaction? 

• The reaction rate will increase.
• The equilibrium of the reaction will be maintained. 
• The reaction rate will decrease.
• The reaction will stop. 

The diagram below illustrates a biochemical process that occurs in organisms. What is another name for the substance labeled "catalyst"?

• Enzyme
• inorganic compound
• Hormone
• Antibody

What is a substance called if it speeds up a chemical reaction?

• reusable
• catalyst
• specific
• fragile