23. The predominant structural feature in myosin molecules is:
(A) a β structure.
(B) an α helix.
(C) the Fab domain.
(D) the light chain.
(E) the meromyosin domain.

15. The predominant structural feature in myosin molecules is: (A) a βstructure. (B) an a helix. (C) the Fab domain. (D) the light chain. (E) the meromyosin domain.

12. The predominant structural feature in myosin molecules is: (A) a β structure. (B)an α helix. (C) the Fab domain. (D)the light chain. (E)the meromyosin domain.

24. Which of the following statements about protein-ligand binding is correct? (A) The Ka is equal to the concentration of ligand when all of the binding sites are occupied. (B) The Ka is independent of such conditions as salt concentration and pH. (C) The larger the Ka (association constant), the weaker the affinity. (D) The larger the Ka, the faster is the binding. (E) The larger the Ka, the smaller the Kd (dissociation constant).

25. The biological role of restriction enzymes is to: (A) aid recombinant DNA research. (B) degrade foreign DNA that enters a bacterium. (C) make bacteria resistant to antibiotics. (D) restrict the damage to DNA by ultraviolet light. (E) restrict the size of DNA in certain bacteria.

複選題1-3. Which of the following protein/molecule is involved in (A) Class I pathway (B) Class II pathway or (C) Both or (D) neither of the antigen presentation? 1. Endogenous antigen 2. Invariant chain (Ii) 3. TAP-1

複選題4-6. Which of the following features is belonging to (A) Class I MHC molecules (B) Class II MHC molecules (C) Both (D) Neither? 4. Accommodates peptides of 20 residues 5. HLA-B 6. Polymorphic residues locate at al and ẞ1 domains.

複選題7-10. Which one of the following properties is related to human immunoglobulin (A) IgM (B) IgD (C) IgG (D) IgA (E) IgE? 7. Lowest amount in the serum 8. Dimeric form transports across epithelia 9. The best Ig to activate complement system 10. Fc portion of Ig is transported by 2 molecules of FcRn (neonatal Fc receptor) across the placenta.

11. Which is NOT the fate of self-responsive B cells in the bone marrow? (A) Clonal expansion (B) Ignorance (C) Generation of non-autoreactive mature B cells (D) Apoptosis (E) Anergy

12. Which one of the following factors is NOT involved in RAG-dependent V( D )J rearrangement? (A) XRCC4 (B) TdT (C) Ku70 (D)DNA-PK (E) AID.

13. A helper T cell response to a protein antigen requires the participation of antigen-presenting cells that express which of the following types of molecules? (A) Class II MHC and co-stimulators (B) Class I MHC and CD4 (C) Class II MHC and CD8 (D) CD4 and co-stimulators (E) Class II MHC and CD4.

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