Chapter 2 Test Review

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

• reusable
• catalyst
• specific
• fragile

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

• Enzymes increase the energy of the reactants.
• Enzymes decrease the energy level of the products.
• Enzyme decrease the activation energy of the reaction.
• Enzymes reverse the direction of the reaction.

Any substance that is acted upon by an enzyme is called a(n)?

• Coenzyme
• Substrate
• Vitamin
• Polypeptide

In the diagram, what is letter A? 

• product
• substrate
• enzyme-substrate complex
• active site

Enzymes are...

• nucleic acids
• proteins
• lipids
• carbohydrates

An enzyme speeds up a chemical reaction in the cell but can only be used once.  True or False? 

• true
• false

What is the function of an enzyme?

• enzymes break themselves into small pieces
• enzymes slow down chemical reactions
• enzymes speed up chemical reactions
• enzymes combine products to form reactants 

Which of these is most likely an enzyme?  

• Sucrose
• Galactose
• Fructose
• Amylase

Letter D...

• active site
• enzyme
• substrate
• products

Letter B...

• active site
• enzyme
• substrate
• products