1) You get the following products from an Edman degradation. Identify the amino acids they came from N མི་ཚེས་༠་ HN Ph 'N=C=S PH 8,0 HN N PH

22-61 Polyglutamic acid (a polypeptide chain made only of glutamic acid residues) has an a-helix conformation below pH 6.0 and a random-coil conformation above pH 6.0. What is the reason for this conformational change?

How many of the -amino acids shown in Table 26-1 contain aromatic rings? How many contain sulfur? How many contain alcohols? How many contain hydrocarbon side chains?

22-104 Why is collagen not a very good source of dietary protein?

22-6 The members of which class of proteins are insoluble in water and can serve as structural materials?

22-59 What is the effect of salt bridges on the tertiary structure of proteins?

For the tripeptide GlyAlaCys a. What amino acid is located at the peptides N-terminal end? b. What amino acid is located at the peptides C-terminal end? c. How many peptide bonds are present? d. How many amide linkages are present?

22-11 Which amino acid has the highest percentage of nitrogen (g N/100 g amino acid)?

Following is the structure of a peptide with the name seryllysylaspartate. What is the amino acid at the N-terminus of this peptide? NH3 CH₂ 0 | CH₂ | CH₂ | CH, O || OH I CH, O || C | CH, O || H₂N-C-C-N-C-C-N-C-C-O I H | I | | HH HH O seryllysine O aspartate O lysine O serine 0=

Some nonessential amino acids are synthesized in the body by a simple transamination. The transamination between oxaloacetate, an a-keto acid, and glutamate, an amino acid with the side chain -CH2CH2COO¯, proceeds according to the following reaction: || → -00C-CH2 CH2 C-CO0 + amino acid 2 0OC-CH2 CCOO +0OC-CH2 CH2 CH-COO → NH3+ Predict the structure of the amino acid product, indicated by amino acid 2, for the reaction. Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default. Include all hydrogen atoms and formal charges. Viou