14. 同上題，圖(三)電路之極點頻率p等於
(A) 1
(B)10
(C)102
(D)103
(E) 104 rad/s

15. BJT電晶體工作在主動區的正確偏壓為(A) EB接面逆向偏壓 CB接面順向偏壓 (B) EB接面順向偏壓 CB接面逆向偏壓 (C) EB接面順向偏壓 CB接面順向偏壓 (D) EB接面逆向偏壓 CB接面逆向偏壓

16. NMOS電晶體當作放大器時，其工作區在(A) pinch-off region (B) cut-off region (C) triode region (D)任何一區

17. MOSFET電晶體直流工作時哪一項參數一定等於零(A)閘極電流 (B)汲極電流 (C)源極電流 (D)三極電流皆不為零

18. p通道場效電晶體(FET)之電荷載子為(A)電子 (B)主載子為電洞、副載子為電子 (C)主載子為電子、副載子為電洞 (D)電洞

19. 當偏壓在順向活性區(forward active)時，基極少數載子的分布比較像哪一圖？(A)(B)(C)(D)(E)

20. 在小訊號交流等效電路中，藕合電容器可視為(A)開路 (B)短路 (C)電阻器 (D)以上皆非

1. To determine the isoelectric point of a protein, first establish that a gel: (A) contains a denaturing detergent that can distribute uniform negative charges over the protein’s surface. (B) exhibits a stable pH gradient when ampholytes become distributed in an electric field. (C) is washed with an antibody specific to the protein of interest. (D) neutralizes all ionic groups on a protein by titrating them with strong bases. (E) relates the unknown protein to a series of protein markers with known molecular weights.

2. Thr and/or Leu residues tend to disrupt an  helix when they occur next to each other in a protein because: (A) an amino acid like Thr is highly hydrophobic. (B) covalent interactions may occur between the Thr side chains. (C) electrostatic repulsion occurs between the Thr side chains. (D) steric hindrance occurs between the bulky Thr side chains. (E) the R group of Thr can form a hydrogen bond.

3. Protein S will fold into its native conformation only when protein Q is also present in the solution. However, protein Q can fold into its native conformation without protein S. Protein Q, therefore, may function as a ____________ for protein S. (A) Ligand (B) molecular chaperone (C) protein precursor (D) structural motif (E) supersecondary structural unit

4. An allosteric interaction between a ligand and a protein is one in which: (A) binding of a molecule to a binding site affects binding of additional molecules to the same site. (B) binding of a molecule to a binding site affects binding properties of another site on the protein. (C) binding of the ligand to the protein is covalent. (D) multiple molecules of the same ligand can bind to the same binding site. (E) two different ligands can bind to the same binding site.

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