Give the following 1. an amino acid that has an aryl side group chain  2. an amino acid that contains a side chain with a thioether bond 3. an amino acid that reacts with HCL through acid-base reaction 4. an amino acid that contains a sulfhydryl side chain 5. an amino acid with a side chain that can form hydrogen bonds with water 6. an amino acid that contains an amide side chain

Predict the functional group of the product for the following reaction. a. ester b. carboxylic acid c. hemiacetal d. acetal e. amide

41. What is the name of the amino acid shown below? ÇOO H,N- CH,SH A L-cysteine B D-cysteine C L-serine D D-serine 42. How is a dipeptide formed? A The -NH3"group of one amino acid forms an amide bond with the -NH3" group of another amino acid and the elements of H2 are removed. B The -NH;group of one amino acid forms an amide bond with the carboxylate (- COO") of another amino acid, and H20 is removed. C The carboxylate (-COO") group of one amino acid forms an amide bond with the carboxylate (-CO0) of another amino acid, and the elements of O2 are removed. D The carboxylate (-CO0") group of one amino acid forms an amide bond the -NH: group of another amino acid, and the elements of Ha are removed.

Which molecule is an amide? a. CH 3 CH₂ CH₂ CH₂ C C. 0 0 b. || CH3 CH₂ CH₂N-C-CH₂-CH3 0 H CH3–CH2CH2CH2C-O-CH2-CH3 e. CH3CH2CH2NH2 d. CH 3 CH₂-CH₂-CH₂-CH₂-C 0 OH