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16 Nov 2019
Which of the following terms best describes the side chain of valine? A) acidic B) basic C) charged, polar D) uncharged, polar E) nonpolar Which of the following best describes the side chain of arginine at a pH of 11? A) hydrophobic B) nonpolar C) charged and polar D) uncharged but polar E) aprotic Give the pH at which histidine exists In the following form. A) 0 B) 4 C) 8 D) 12 E) 14 When a disulfide linkage Is formed, the compound containing this new' linkage has been A) hydrolyzed. B) dehydrated. C) electrolyzed. D) oxidized. E) reduced. In conventional peptide synthesis, the nitrogen of a given amino acid must be deactivated or blocked while the carboxyl group Is activated. Which of the following reagents Is used to protect the amino group of an amino acid? A) di-tert-butyl bicarbonate B) dicyclohexylcarbodiimide C) ninhydrin D) trifluoroacetic acid E) phenylisothiocyanate In peptide synthesis, give the use of dicyclohexylcarbodiimide. A) activates the carboxyl group of an amino acid B) protects the carboxyl group of an amino acid C) protects the amino group of an amino acid D) activates the amino group of an amino acid E) removes the protecting group on the N-terminal amino acid
Which of the following terms best describes the side chain of valine? A) acidic B) basic C) charged, polar D) uncharged, polar E) nonpolar Which of the following best describes the side chain of arginine at a pH of 11? A) hydrophobic B) nonpolar C) charged and polar D) uncharged but polar E) aprotic Give the pH at which histidine exists In the following form. A) 0 B) 4 C) 8 D) 12 E) 14 When a disulfide linkage Is formed, the compound containing this new' linkage has been A) hydrolyzed. B) dehydrated. C) electrolyzed. D) oxidized. E) reduced. In conventional peptide synthesis, the nitrogen of a given amino acid must be deactivated or blocked while the carboxyl group Is activated. Which of the following reagents Is used to protect the amino group of an amino acid? A) di-tert-butyl bicarbonate B) dicyclohexylcarbodiimide C) ninhydrin D) trifluoroacetic acid E) phenylisothiocyanate In peptide synthesis, give the use of dicyclohexylcarbodiimide. A) activates the carboxyl group of an amino acid B) protects the carboxyl group of an amino acid C) protects the amino group of an amino acid D) activates the amino group of an amino acid E) removes the protecting group on the N-terminal amino acid
Jamar FerryLv2
27 Jul 2019