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(Solved) (Latest ver. Aug 2020) - Peptide Bonds, Amino Acids and Chemical Structures

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I need some help with biochemical questions:
1. How do you calculate the pH of a solution of lysine if the side chain amino group is 3/4 dissociated?
2. What is the isoelectric point of His?
3. For L-Ile, describe with drawings why it is 2S,3S?
4. What are the 6 atoms that are coplanar due to the resticted rotation about the peptide bond?
5. How many different tetrapeptide sequences are possible of the number of different amino acid types is 20?
6. Draw the chemical structures for tripeptides G-F-F and for F-F-G..are they the same?


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