hello! please answer ALL questions correctly. thank you so much, i really appreciate it!

Which of the following structures shows the prevalent form of glutamic acid at pH3? a d a b C d none of these choices What is the N-terminal residue of the peptide AYSDG? glutamic acid glycine aspartic acid alanine none of these choices Which amino acid does not have a primary a-amino group? lysine glutamate arginine proline glutamine The diagram below shows a polypeptide an amino acid a dipeptide a tripeptide a tetrapeptide Leucine and alanine have large, nonpolar side chains. True False The zebrafish is a good animal model to test the actions of various drugs. The zebrafish produces a novel heptapeptide that binds to opiate receptors in the brain. The sequence of the peptide is Tyr-Gly-Gly-Phe-Met-Gly-Tyr. Draw the structure of the heptapeptide at pH 7. Do not show stereochemistry in your