Multiple Choice Questions
 

1.  All of the chemical reactions of the cell are called  
A.  Catabolism
B.  Redox reactions
C.  Phosphorylation
D.  Metabolism
E.  Cellular respiration

2.  Enzymes are  
A.  Broken down in reactions that require energy input
B.  Proteins that function as catalysts
C.  Used up in chemical reactions
D.  Not needed for catabolic reactions
E.  All of the choices are correct

3.  Formation of peptide bonds between amino acids to build a polypeptide would be called  
A.  Anabolism
B.  Phosphorylation
C.  Fermentation
D.  Exergonic
E.  Glycolysis

4.  Reactants are converted to products by  
A.  Enzymes releasing energy
B.  Breaking and forming bonds
C.  Enzymes binding to reactants
D.  Reactants releasing energy
E.  None of the choices are correct

5.  Each of the following are true of enzymes except  
A.  They can be used over and over
B.  They may or may not require cofactors
C.  Their active site is specific to the substrate
D.  They increase the activation energy of a reaction
E.  All of the choices are true of enzymes

6.  The cell’s metabolic reactions involve the participation of _____ that lower the activation energy needed for the initiation of a reaction.  
A.  Cofactors
B.  Vitamins
C.  Enzymes
D.  ATP
E.  Coenzymes

7.  An apoenzyme  
A.  Is part of a simple enzyme
B.  Is also called a coenzyme
C.  Is the protein part of a holoenzyme
D.  Is often an inorganic metal ion
E.  Is an RNA molecule

8.  A holoenzyme is a combination of a protein and one or more substances called  
A.  Substrates
B.  Apoenzymes
C.  Catalysts
D.  Cofactors
E.  None of the choices are correct

9.  Important components of coenzymes are  
A.  Vitamins
B.  Metallic ions
C.  Active sites
D.  Substrates
E.  Ribozymes

10.  A type of cofactor would be  
A.  Vitamins
B.  Metallic ions
C.  Active sites
D.  Substrates
E.  Ribozymes