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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 8

Explanation / 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)

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