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D.

 

Protein A is a structural component while Protein B is an enzyme. The secondary structures 
of both proteins are studied. (Questions 16-19) 

 

 

16._____ 

Which could be characteristics of Protein A and Protein B? 

 

 

a) 

Protein A could have a low energy conformation while Protein B could  

                                    have a high energy conformation. 
                        b) 

Protein A could be a globular protein while Protein B could be a fibrous  

                                    protein. 

c) 

Protein A could contain mainly 

α

-helix while Protein B could contain 

equal amounts of 

α

-helix and 

β

-sheet. 

 

 

d) 

Protein A could be a type of collagen while Protein B could be a type of  

                                     keratin. 
 
17._____ 

Which could be found within the structure of Protein B? 

 

                        

 

 

a) 

A disulfide bond could form between two prosthetic groups. 

 

 

b) 

A salt bridge could form between two chaperones. 

                        c) 

Protein B could contain areas of random secondary structure stabilized by 
van der Waals forces.  

                        

d) 

Protein B could contain areas of repeating secondary structure stabilized 
by hydrogen bonds. 

 
18._____ 

Which is a characteristic of both an 

α

-helix and a 

β

-pleated sheet? 

a) 

Both can be anti-parallel structures. 

b) 

Both form interactions involving the oxygens of peptide bonds. 

c)         Both are found only within multimeric proteins. 
d) 

Both are denatured when heat breaks peptide bonds. 

 
19._____ 

Which is a difference between an 

α

-helix and a 

β

-pleated sheet? 

 

 

a) 

An 

α

-helix is a right-handed structure containing disulfide bonds while a                 

                                    

β

-pleated sheet is a left-handed structure containing ionic bonds. 

b) An 

α

-helix has a relatively extended spiral shape while a 

β

-pleated sheet has 

a relatively compact zig-zag shape. 

c) An 

α

-helix has non-covalent bonds between amino acids near each other 

in the sequence while a 

β

-pleated sheet has non-covalent bonds between 

amino acids far apart in the sequence. 

  d) 

An 

α

-helix contains mainly amino acids with polar R-groups while a 

β

                                    pleated sheet contains mainly amino acids with non-polar R-groups. 
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Comments:

Proteins & Enzymes questions with answers

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