Which of the following statements are False?

(i) Parallel b-sheets characteristically distribute hydrophobic side chains on both sides of the sheet, and antiparallel B-sheets are usually arranged with all their hydrophobic residues on one side of the sheet.

(ii) Planarity of the peptide bond means that no rotation occurs about the N-Ca bond while rotation is allowed about the C(O)-N and Ca-C(O) bonds.

(iii) Silk fibers consist of fibroin proteins consisting of alternating A and G or S residues.

(iv) If an aspartic acid residue were present in the interior of a globular protein, it would most likely be deprotonated and thus negatively charged.

If an aspartic acid were present in the interior of a globular protein, it would most likely change the conformation of the protein, maybe changing its shape and ultimately its function. To ensure compactness of the interior, hydrophobic amino acid are mainly found in the interior of globular proteins. This acid can be deprotonated and become negatively charged if the surrounding solution's pH is raised changing their isoelectric points.