43. The amino acid glycine is known as an α-helix breaker. Thus, a glycine-rich sequence should NOT form an α-helix, why? (A)Glycine cannot form the typical i→ i+4 hydrogen bond. (B)The side-chain of glycine is too large. (C)Glycine is structurally the most flexible amino acid. (D)The side-chain of glycine is negatively charged. (E)Glycine is too hydrophobic