52. Amino acid N-terminal analysis of peptides is often done with
(A) carboxypeptidase
(B) phenylisothiocyanate
(C) dicyclohexylcarbodiimide
(D) ethyl chloroformate
(E) none of them

53. Which of the following arrangements is usually not found in the secondary structure of proteins?(A) α-helix (B) double helix (C) random coil(D) pleated sheet (E) all of the above arrangements can be found in the secondary structure of proteins

54. The standard amino acids are stereochemically related to(A) D-glucose (B) L-glyceraldehyde (C) D-glyceraldehyde (D) glycine (E) L-alanine

55. The best reagent to distinguish between CH3(CH2)10CO2H and CH3(CH2)4CH=CH(CH2)4CO2H is(A) NaOH, H2O (B) Tollen’s reagent (C) H2Cr2O7 (D) Li, NH3 (E) Br2/CCl4

56. Which of the following is piperidine?(A)(B)(C)(D)(E)

57. Which of the following is indole?(A)(B)(C)(D)(E)

58. Which of the following is oxetane?(A)(B)(C)(D)(E)

59. How many peaks will you expect from 13C NMR spectrum of(A) 5 (B) 6 (C) 7 (D) 8 (E) 9

60. Which of the following molecules will have a net dipole moment?(A)CCl4 (B) H2C=CH2 (C) Cl2C=CCl2(D)(E)

61. What monomer(s) is (are) needed to make the polymer shown below? I. HOCH2CH2OH  II. HOOCCH2CH2COOH  III. HOCH2CH2COOHIV. HOCH=CHOH   V. HOOCCH=CHCOOH(A) II (B) III (C) I and II (D) IV and V (E) II and III

62. Baking powder, a mixture of cream of tartar (KHC4H4O6, molar mass 188 g/mol) and baking soda (NaHCO3, molar mass 84.0 g/mol), undergoes the following reaction at baking temperature:(The CO2 makes the cake rise.) A recipe calls for two level teaspoons (a total of 8.0g) of cream of tartar. How much baking soda must be added for both materials to react completely?(A) 0.45 g (B) 1.8g (C) 3.6g (D) 8.0 g (E) none of these

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