16. Draw the products of the following transesterification: excess CH OH 17. Som
ID: 104930 • Letter: 1
Question
16. Draw the products of the following transesterification: excess CH OH 17. Some questions about amino acids and proteins: COOH i. Consider the Fischer projection of the amino acid to the right: The name of this amino acid is Hac Is the side chain of this amino acid hydrophobic or hydrophilic? Hydrophobic Hydrophilic This is an example ofa (alpha, beta, g amino acid. How many different amino acids make up the proteins found in the human B. 16 A. 4 C. 20 D. 125 E. This has not yet been determined. Which amino acid contains a thiol in its R group? A. methionine B. alanine C. cysteine E. valine In a solution that is highly acidic (low pH), hich of the following forms of the amino acid alanine (Ala) would predominate? (We talked about this in a more quantitative way using pH and pKa.) vi. acid? Which of the following forms of the amino acid alanine (Ala) is the zwitterion form of this amino vii. A "peptide linkage" is another name for what functional group? What is the product of the following 18. reaction? OH NH A) I D)IV B) II E) V C) III Page 8 of 8Explanation / Answer
16.
CH3CH2COOCH2CH3 + CH3OH -------------> CH3CH2COOCH3 + CH3CH2OH
17.
(i) Name is : Phenyl alanine.
side chain is hydrophobic
(ii) It is an example of alpha amino acid
(iii) (C) 20
(iv) (C)
(v) (A)
(vi) (B)
(vii) Amide
(18)
(B)