1. The list of standard protein amino acids has been expanded from 20 to 23. How are the extra three amino acids incorporated into proteins? 2. What

1.   The list of standard protein amino acids has been expanded from 20 to 23. How are the extra three amino acids incorporated into proteins?

2.  What are non-standard protein amino acids? How are they incorporated into proteins?

3. What are the functions of non-protein amino acids?