16. Which type of amino acid is positively charged at physiological pH? (A) Nonpolar amino acids (B) Polar, uncharged amino acids (C) Acidic amino acids (D) Basic amino acids

1. Which of the following is NOT a distinctive property of living systems? (A) Living organisms exhibit a high level of organization. (B) Biological structures are related to specific functions. (C) Living systems have the capacity for reproduction. (D) Living systems do not carry out energy transformation.