C.
Protein A is an
α
-keratin while Protein B is a transport protein. (Questions 11-15)
11._____
Which characteristic could be shared by Protein A and Protein B?
a)
Both could be fibrous proteins containing multiple polypeptide chains.
b)
Both
could
be
globular
proteins with similar primary structures.
c)
Both could contain disulfide bridges linking methionine residues.
d)
Both could contain hydrogen bonds between peptide bond atoms.
12._____
When comparing Protein A to a
β
-keratin
a)
the
α
-keratin has a parallel structure while the
β
-keratin has an antiparallel
structure.
b) the
α
-keratin has a compact structure while the
β
-keratin has a more
extended structure.
c)
both have similar secondary structures that are low-energy states for the
proteins.
d) both contain hydroxyproline which functions as a prosthetic group.
13._____
When comparing Protein B to collagen,
a)
both are stabilized by van der Waals interactions.
b) both are stabilized by extensive regions of left-handed coils.
c)
both contain regions of random secondary structures.
d) both
contain
α
-helices as well as
β
-pleated sheets.
14._____
Which interaction is likely to occur in Protein B?
a)
A hydrophobic interaction could form between the R-groups of Val and
Leu.
b)
A hydrogen bond could form between the R-groups of Ser and Phe.
c)
A salt bridge could form between the R-groups of Arg and His.
d)
An ionic bond could form between the R-groups of Gln and Trp.
15._____ When comparing Protein A to Protein B,
a) both could be denatured by using heat to break amide bonds.
b) both could have primary structures that form with the help of chaperones.
c) both have conformations stabilized by numerous non-covalent bonds.
d) both contain the same proportions of hydrophilic and hydrophobic R-
groups.
