How do amino acid sequences influence the properties of a protein?

A. Covalent bonding occurs between parallel amino acid chains, forming β-pleated sheets.
B. Disulfide bonds between neighboring amino acid side chains can cause an α helix to form.
C. Hydrogen bonding between every fourth amino acid results in formation of an α helix.
D. Strands of amino acids form peptide bonds with each other, resulting in β-pleated sheets.