13. Which of the following species is optically active?
(A) NH₂C1
(B)
(C)
(D) SiFCBrI
(E) HCN

9.Which of the following reagents is used to protect the amino group of the N-terminal residue in solution-phase peptide synthesis? (A) benzyl chloroformate (B) lithium diisopropyl amide (C) phenyl isothiocyanate (D) dicyelohexylcarbodiimide (E) trifluoroacetic acid

10. What is the major end product of the following reaction series? (A) Ala (B) Gly (C) Leu (D) Ile (E) Val

11. Treatment of a peptide which contains disulfide linkages with peroxyformic acid yields a peptide which contains what new amino acid residue? (A) cystine (B) cysteic acid (C) 4-hydroxyproline (D) y-alanine (E) methioic acid

複選題12. Which of the following groups contains the molecules that do not have a same point group? (A) CO2 and C2H2 (B) PCls and BF3 (C) POCl3 and NH3 (D) SO2F2 and H2O (E) CH4 and XeF4 COOH

14. What is the purpose of a moderator surrounding the uranium cylinder in a nuclear (fission)reactor core?(A) To slow down the neutrons(B) To accelerate the neutrons(C) To produce a particles(D) To absorb B particles(E) To absorb the neutrons

15. Which of the following instruments is/are used to detect and measure radioactivity levels?I. Geiger counterII. Richter scaleIII. Seismic scaleIV. Scintillation counter(A) I only (B) III only (C)I&IV (D)I&I(E) I, I, II&IV

16. How many of the following ligands are capable of linkage isomerism? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

17. You analyze for pyridine () by dissolving 0.1000 g of the complex in 100 mL of H2O and titrating with a 0.01 M HCI solution. Which of the following indicators should be used to detect the endpoint? (Assume that the initial concentration of pyridine is approximately 0.01 M.) (A) thymol blue, pH range of color change = 8.0-9.6 (B) methyl red, pH range of color change = 4.8-6.0 (C) bromophenol blue, pH range of color change = 3.0-4.6 (D) bromothymol blue, pH range of color change = 6.0-7.6 (E) alizarin yellow, pH range of color change = 10.1-12.0

18. Which of the following is paramagnetic? (A) (B) (C)(D)(E

19. Which of the following statements about biomolecules is TRUE? (A) Messenger RNA can be found in both the nucleus and the cytoplasm of each cell. (B) Nonpolar groups tend to face the outside of a protein in aqueous solution. (C) Nucleic acids are made of nucleotides joined together with amide bonds. (D) A glycosidic linkage in polysaccharides is an ester group. (E) Table sugar is formed from B-D-glucose and B-D-fructose.