Which of the following statements about amino acids is incorrect? a turn or kink in a protein is more likely to be induced by a proline than by a glycine. the more glycines that are found in a polypeptide's primary sequence, the more flexible the backbone of that polypeptide. the bridge between cysteines, which connects parts of a protein, is a stable but noncovalent interaction. not every amino acid is asymmetric. at typical cellular ph, the r groups of basic amino acids are positively charged.