There are 20100 different possible sequence combinations for a protein chain with 100 amino acids. In addition to the amino acid sequence of the protein, what other factors increase the potential for diversity in these macromolecules?
(a) free rotation around single bonds during synthesis
(b) noncovalent interactions sampled as protein folds
(c) the directionality of amino acids being added
(d) the planar nature of the peptide bond
Answer: A