3. Besides finding R¡ values, describe another way you could have determined the identity of the amino acids in your mixture.

I'm struggling with this chemistry. Can you help me?

7.

Identify the part of a generic amino acid that reacts with base and the part that reacts with acid. Briefly explain your answer.Hint: Draw Lewis structures for ammonia (NH 3) and acetic acid (CH 3COOH).

4 An aqueous solution of an amino acid with a dissociable side chain is found to have the following side chain ratio at pH 4.0: K=[A- ]/[HA]=0.01. What is the identity of the amino acid?

Draw the product that valine forms when it reacts with di-tert-butyl dicarbonate and triethylamine followed by an aqueous acid wash. O • You do not have to consider stereochemistry. • Do not draw organic or inorganic by-products. • Draw the product in neutral form unless conditions are clearly designed to give an ionic product. • Include cationic counter-ions, e.g., Na+ in your answer, but draw them in their own sketcher. • Do not include anionic counter-ions, e.g., I, in your answer. 90.0 ChemDoodle /n [F

4. For the Amino Acid you have been assigned, at the pH values provided, draw the structure(s) at each of the specified pH values. serine and pH = 0, 7, and 9 5. What is the overall charge for each of the structures you drew?

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Draw a resonance structure, complete with all formal charges and lone (unshared) electron pairs, that shows the resonance interaction of the amino with the ortho position in aniline. NH₂ aniline • You do not have to consider stereochemistry. • Include all valence lone pairs in your answer. • In cases where there is more than one answer, just draw one. My 3 $390.05 Jn [F +▼

7. Explain why 2-phenylethyl boronic acid (Compound A) is an inhibitor of chymotrypsin, which is an enzyme that catalyzes the hydrolysis of peptide linkages. What type of inhibition do you think is exemplified here? OH -CH2-CH2 B HO, Compound A