Write out the un-ionized structure of valine & phnylalanine. Do either have enantiomers?
Write the zwitterion structures of both.
Show what happens if it becomes more acidic.
Write structure for phe-val (ionized or unionized). Is it the same as val-phe? Why?
Would the dipeptide be neutral, acidic, or basic? Why?
I have attached a powerpoint presentation dealing with amino acids. Un-ionized basically means they don't have charges floating around. See slide 11 for the difference between un-ionized and ...
125 word solution as well as an attached 15-page Powerpoint presentation on amino acid classifications.