14. An action potential of neuron is characterized by the following, except_____  .
(A) it is initiated by opening of voltage-gated potassium channels
(B) it is regarded as a regenerative response
(C) it is regarded as a all-or-none response
(D) it does not degrade in magnitute with space or time
(E) it is transmembrane potential changes that occur in most axons

10. Glucose in human hepatocyte can be synthesized from which combination of the following non-sugar sources? ①  adenine ②  alanine ③ lactate  ④  palmitate⑤glycerol (A) ① ② ③ (B)①④ (C) ② ③ ④ ⑤ (D) ④ ⑤(E) ② ③⑤

11. Acne is caused by infection of the sebaceous glands by Propionibacterium acne, which is Gram-positive bacterium whose cell wall composed of which of the following? (A) thick lipopolysaccharide layer (B) thick peptidoglycan layer (C) thin lipopolysaccharide layer over a thick peptidoglycan layer (D) thick lipopolysaccharide layer over a thin peptidoglycan layer (E) thick lipopolysaccharide layer over a thick peptidoglycan layer

12. Which of the following is the least possible growth limitation factor for a plant community? (A) nitrogen source (B) carbon source (C) phosphorus source (D) potassium source (E) water source 

13. According to their pigmentation, which algal group would be most likely to perform photosynthesis in the deepest sea? (A) red algae (B) green algae (C) brown algae (D) golden algae (E) blue-green algae

15. What is hormone most active in a person who is subjective to short-term starvation? (A) insulin (B) glucagon (C) epinephrine (D) oxytocin (E) glucocorticoids

16. Which of the following hormone secreted from hypothalamus? (A) thyrotropin releasing hormone (B) oxytocin (C) luteinizing hormone (D) glucagon (E) glucocorticoids

17. Which of the following is NOT a factor influencing membrane fluidity? (A) number of double bond in lipids (B) temperature (C) flip-flop move of lipids (D) cholesterol (E) none of the above

18. Which of the following is required for synthesis of prothrombin and blood coagulation factors in hepatocyte? (A) folic acid (B) vitamin K (C) vitamin B12 (D) vitamin A (E) vitamin B1

19. Where do you find the cells undergo meiosis in plants? (A) shoot apical meristem (B) pollens (C) embryo sacs (D) corolla (E) ovule

20. When animal cell loss its extra-membranous oligosaccharides, it will be deficient in which of the following function? (A) the aggregation of cytoskeleton (B) the intercellular recognition (C) the exchange of proton across the membrane (D) the change of membrane action potential (E) the calcium influx or efflux