79. 表面粗糙度的單位為
(A)cm
(B)㎜
(C)μm
(D)dm。

80. 在 MS 視窗作業系統中，要選取多個非連續的檔案，在選取前須先按住 (A)Ctrl 鍵 (B)Alt 鍵 (C)Shift 鍵 (D)Ins 鍵。

1A new organism was discovered in the forests of Costa Rica. Scientists determined that the new organism's hemoglobin polypeptide sequence differs by 72 amino acids from humans, 65 from a gibbon, 49 from a rat, and five from a frog. These data suggest that the new organism is more closely related to _______.(A)humans than to frogs(B)frogs than to humans(C) rats than to frogs(D)gibbons than to rats

2 An enzyme is composed of four identical subunits. Substrate binding to one subunit stimulates more rapid substrate binding to the other three subunits. Which of the following mechanisms is this enzyme most likely regulated?(A)noncompetitive inhibition(B)competitive activation(C) competitive inhibition(D)cooperativity

3 Which of the following statements provides the most plausible explanation for the results of this experiment?(A)The two sponge species had different enzymes that functioned in the reassembly process.(B)The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment.(C) The molecules responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge.(D)One cell functioned as an organizer for each organism, attracting only cells of the same species.

4Human immunodeficiency virus (HIV) infects cells with CD4 and CCR5 cell nolecules. The viral nucleic acid molecules are enclosed in a protei m and the protein capsid is contained inside an envelope consisting of a lipid bilayer membrane and viral glycoproteins. One hypothesis for viral entry into cells is that the ng of HIV membrane glycoproteins to CD4 and CCR5 initiates the fV membrane with the plasma membrane, releasing the viral capsicytoplasm. An alternative hypothesis is that HIV gains entry into the cell via receptor-mediated endocytosis, and membrane fusion occurs in the endocytotic vesicle. To testthese alternative hypotheses for HIV entry, researchers labeled the lipids on the HIV membrane with a red fluorescent dye. What would be observed by live-cell fluorescence microscopy immediately after HIV entry if HIV enters the cell by endocytosis first and then later fuses with the endocytotic vesicle membrane?(A)The infected cell's plasma membrane will show a spot of red fluorescence, marking the site of membrane fusion and HIV entry.(B)The red fluorescent dye-labeled lipids will appear in the infected cell's interior.(C) A spot of red fluorescence will diffuse in the infected cell's cytoplasm.(D) A spot of red fluorescence will remain outside the cell after delivering the viral capsid.

5Which of the following statements best describes why C. elegans is an excellent model organism for investigating apoptosis. (A)Cells in C. elegans do not naturally undergo apoptosis but can be induced to do so in the laboratory. (B)C. elegans undergoes a fixed and easy-to-visualize number of apoptotic events during normal development. (C) C. elegans has large cells wherein apoptosis is easily observed without a microscope. (D) Death in C. elegans through a well-defined sequence of apoptotic events.

6 When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs? (A)The pH of the matrix increases. (B)ATP synthase pumps protons by active transport. (C) The electrons gain free energy. (D) NAD+ is oxidized.

7Which of the following statements best describes a characteristic of C4 plants? (A)They can fix CO2 at lower CO2 concentrations and higher oxygen concentrations than C3 plants. (B)They have higher rates of photorespiration than C3 plants. (C) They use rubisco for carbon fixation, whereas C3 plants do not. (D) They produce oxaloacetate, a four-carbon compound, which is then delivered to the citric acid cycle in mitochondria.

8 Cell A has half as much DNA as cells B, C, and D in a mitotically active tissue. Cell A is most likely in_________.(A)G1(B)G2(C) prophase(D)metaphase

9 Meiosis II is similar to mitosis in that_________.(A)sister chromatids separate during anaphase(B)DNA replicates before the division(C) the daughter cells are diploid(D)homologous chromosomes synapse

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