practicefinal - 1. The pKa's of the acidic hydrogens of...

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1. The pK a 's of the acidic hydrogens of lysine are shown below. What is the isoelectric point of lysine? 8.95 10.53 2.18 CO 2 H CH 2 2 2 2 NH 3 H 3 A) 2.18 B) 5.56 C) 6.36 D) 9.74 2. The Fischer projection shown below denotes a ______ amino acid which has the _____ configuration. 2 - 2 C 6 H 5 H 3 A) D, S B) D, R C) L, S D) L, R 3. In strongly acidic solution L-lysine is primarily a dication as shown below. As the pH is raised, which proton is lost to form the monocation? 2 H 2 2 2 2 3 H 3 2) 4) 1) 3) A) is 1 B) is 2 C) is 3 D) is 4 Page 1
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4. What is the total number of different tripeptides which can result from three different L- amino acids? A) three B) four C) six D) nine 5. A pentapeptide was found to contain the amino acids ala, gly, met, phe, and ser. Partial hydrolysis of the pentapeptide gave the dipeptides gly-ser, met-phe, ala-gly, and ser- met. What is the sequence of the pentapeptide? A) gly-ser-met-phe-ala B) gly-ser-met-ala-phe C) ala-gly-ser-phe-met D) ala-gly-ser-met-phe 6. Which one of the following is the final product of the reaction sequence shown below? H 3 C C NHCHCO 2 Et O CO 2 (1) NaOEt, EtOH H 2 O, H + heat (2) (CH 3 ) 2 CHCH 2 Br 1) (CH 3 ) 2 CHCHCO 2 H 3) CH 3 CNHCH 2 CH(CH 3 ) 2 2) (CH 3 ) 2 CHCH 2 CHCO 2 4) (CH 3
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This note was uploaded on 02/10/2011 for the course CHEM 2420 taught by Professor Staff during the Spring '08 term at Univeristy of Wyoming- Laramie.

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practicefinal - 1. The pKa's of the acidic hydrogens of...

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