1. Which of the following is the predominant form of serine at physiological pH?

ID: 882014 • Letter: 1

Question

A) I
B) II
C) III
D) IV
E) V

2. Which of the following peptides is not cleaved by trypsin?

A) Gly-Ser-Ile-Lys
B) Gly-Lys-Cys-Phe
C) Cys-Ala-Arg-Ser
D) Ala-Lys-Tyr-Arg

3. Which of the following will migrate the farthest when an eletrophoresis experiment is carried out at pH 7?

A) aspartic acid (pI = 2.8)
B) serine (pI = 5.7)
C) glycine (pI = 6.0)
D) proline (pI = 6.3)
E) histidine (pI = 7.6)

4. How many peptide bonds are there in a polypeptide that contains 30 amino acids?

A) 31
B) 28
C) 30
D) 29
E) 27

5. Which of the following amino acids have an acidic side chain?

A) I, II & III
B) IV & V
C) I & III
D) All of them
E) II, IV & V

1) optionC

2) B and C

3) A

4) D

5) C

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