1.Vioxx and other prescription nonsteroidal anti-inflammatory drugs (NSAIDs) are potent inhibitors ot the cyclooxygenase-2 (COX-2) enzyme. The inhibitory efficacy of these drugs is decreased in the presence of high substrate concentrations. These drugs are
(A) allosteric regulators.
(B) prosthetic groups.
(C) feedback inhibitors.
(D) competitive inhibitors.
(E) noncompetitive inhibitors.

4.下列哪個器官不可以使用脂肪酸,只可以使用葡萄糖做為能量來源 (A)肌肉 (B)肝臓 (C)心臓 (D)大腦

5.下列哪個物質不屬於DNA的核酸序列 (A)A (B)T (C)C (D)U

6.下列何者是人體內最小的胺基酸 (A)Glycine(甘氨酸) (B)Cysteine(半胱胺酸) (C)Arginine (精氨酸) (D)Lysine(離胺酸)

複選題7.下列哪個称不是DNA在複製時需要用到了酶 (A)DNA聚合醇(DNA Polymerase) (B)DNA連接酸(DNA ligase) (C)DNA導引酸(DNA primase) (D)DNA甲基轉移(DNA methyItransferase)

2. Three cells with distinct volumes and surface arcas are listed in the following table:Based on data from the table above, which of the following statements "best" explains which cell will 10.2um3 Cell 3 27.3 um2 eliminate wastes most inefficiently? (A) Cell 1 because it has the lowest ratio of surface area to volume, which will enable it to eliminate its wastes most inefficiently. (B) Cell 2 because it has the highest ratio of surface area to volume, which will enable it to climinate its wastes most inefficiently. (C) Cell 3 because it has the smallest volume, which will cnable it to eliminate its wastes most inefficiently. (D) Cell 3 because it has the smallest surface area, which will enable it to eliminate its wastes most inefficiently.

3. Of the following events, which best describes the steps in a signal transduction pathway? a)Tyrosine kinase receptor subunits dimerize； b) An enzyme cascade occurs, increasing of activated proteins； c) A reconfigured protein binds to DNA, altering gene expression； d) A signal molecule is bound by a transmembrane tyrosine kinase receptor protein； e) The receptor protcin complex phosphorylates other proteins. (A) adbec(B) adecb(C) daebc(D) deabc(E) aedcb

4.It has been reported that long-term hormone replacement therapy (HRT) in women with menopause may increase the risk of cancer, possibly because (A) Hormone opens channels in the membrane for other substances to enter (B) Hormone receptor opens channels in the nuclear envelope for cytoplasmic molecules to enter (C) Hormone enables water-soluble molecules to diffuse across membranes (D) Hormone-receptor complex regulates gene transcription in the nucleus (E) Hormone-receptor complex transfers the phosphate groups from ATP

5.Individuals with the inherited disease familial hypercholesterolemia have a very high level of cholesterol in the blood because the cholesterol can't be transported by (A) pinocytosis (B) receptor-mediated endocytosis (C) exocytosis (D) phagocytosis (E) facilitated diffusion

6. The drug cytochalasin B binds to the barbed end of actin. Which of the following events of the cell cycle in animal cells would be most likely disrupted by cytochalasin B? (A) spindle formation (B) spindle attachment to kinetochores (C) separation of sister chromatids (D) movement of chromosomes to the poles during anaphase (E) cleavage furrow formation and cytokinesis

7.Which of the following statements describes one characteristic of each chromosome in a cell during the entire process of meiosis I? (A) Each chromosome is joined with its homologous pair to form a synaptonemal complex. (B) Each chromosome is paired with a homologous chromosome. (C) Each chromosome consists of two sister chromatids joined by a centromere. (D) Each chromosome consists of a single strand of DNA. (E) Sister chromatids cross over.