30. What is meant by an asymmetric carbon atom in an amino acid? What symmetry of amino acids is encountered in most proteins of living organisms? Why is the other symmetry form not found? Could life on another planet have begun using the other symmetry form of amino acids?

31. How do the side chains of amino acids effect their behaviour? What kinds of chemical behaviour can the side chains of the 20 naturally occuring amino acids exhibit?

32. How are amino acids combined to form a protein molecule? What molecule is released during this combination process? What is the reverse of this combining process called?

33. How is the order, or sequence, of amino acids along a protein chain determined before the protein is made?