20. 求 $10^{\frac{1}{3}} \times 10^{\frac{-1}{9}} \times 10^{\frac{1}{27}} \times 10^{\frac{-1}{81}}$ 的值為何？
(A) $10^{\frac{16}{81}}$
(B) $10^{\frac{18}{81}}$
(C) $10^{\frac{20}{81}}$
(D) $10^{\frac{22}{81}}$

1. Which of the following statements best describes the function of tyrosine kinase? (A)It catalyzes the formation of dopamine from L-dopa. (B)It catalyzes the formation of norepinephrine from dopamine. (C) It catalyzes the phosphorylation of a protein inside a cell. (D) It catalyzes the phosphorylation of a protein in the extracellular fluid. (E)It sequesters calcium in the cytosol.

2. Cyclic AMP (cAMP) stimulates one's metabolic rate. Many supplement companies offer products claiming to increase the levels of this chemical within the body. If you had a patient on this supplement and they had high levels of cAMP in their body, what symptoms would you expect them to display? (A)weight loss and a high temperature (B)weight gain and lethargy (C) hypoglycemia and low blood pressure (D) high G protein and sugar levels in their urine (E)increased heart rate and shallow breathing

3. The change in membrane potential that occurs in skeletal muscle cells in response to acetylcholine binding to its receptors is called a(n) (A)repolarizing potential. (B)hyperpolarizing potential. (C) end-plate potential. (D) inhibitory post synaptic potential. (E)refractory period.

4. Myasthenia gravis primarily affects women and its defining characteristic is fatigue of unusually rapid onset and severity following the use of certain muscle groups. What symptoms below best allude to the set of muscles affected by this disease? (A)difficulty walking due to fatigue in the major muscles of the legs (B)relaxed bladder causing frequent urination (C) difficulty speaking, difficulty swallowing, and drooping eyelids (D) difficulty moving the joints of the fingers and toes (E)difficulty in fine motor control of the fingers, especially the thumb

5. Which of the following couplings between neurotransmitter and neurotransmitter class is INCORRECT? (A)adenosine : amino acid (B)norepinephrine : catecholamine (C) histamine : biogenic amine (D) enkephalin : neuropeptide (E)nitric oxide : gas

6. The compliance of the lung is determined by the elasticity of the lung and (A)volume. (B)transpulmonary pressure. (C) airway resistance. (D) surface tension. (E)intra-alveolar pressure.

7. What is the volume of air moved into and out of the lungs in a single breath during unforced breathing called? (A)total lung capacity (B)functional residual capacity (C) tidal volume (D) vital capacity (E)minute ventilation

8. Which of the following best describes the function of the blood-testis barrier? (A)It maintains a differential fluid composition of the seminiferous tubule lumen that facilitates development of sperm and protects sperm from the immune system. (B)It maintains a differential fluid composition of the seminiferous tubule lumen that facilitates the development of sperm and blocks the access of androgens to the lumen. (C) It maintains a differential fluid composition of the seminiferous tubule lumen that facilitates the entry of inhibin into the lumen, thereby decreasing sperm production. (D) It maintains a differential fluid composition of the epididymis tubule lumen that facilitates movement of sperm during emission. (E)It maintains a differential fluid composition of the epididymis tubule lumen that favors maintaining high concentrations of androgens in the lumen to facilitate sperm production.

9. What secretes an alkaline fluid containing fructose, enzymes, and prostaglandins into the ejaculatory duct? (A)seminal vesicle (B)prostate gland (C) bulbourethral gland (D) epididymis (E)Sertoli cell

10. Which nerves innervate the anterior thigh? (A)cranial nerves (B)cervical nerves (C) sacral nerves (D) thoracic nerves (E)lumbar nerves

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