Which of the Following Changes Would Not Alter the Functional

Multiple Choice

Which of the following changes would not alter the functional characteristics of α keratin?

A) Increasing the number of residues per turn to 4.1 while maintaining the same amino acid sequence.
B) Substitution of a hydrophilic amino acid for a hydrophobic amino acid at position a and d of the 7-residue pseudorepeat.
C) Decreasing the number of cysteine amino acids within each protofilament.
D) Changing the environment surrounding the protein to one that is more reductive.
E) All of the above would alter the functional characteristics of keratin.