1.According to the fluid-mosaic model of cellular membrane structure: A)all membranes have a lipid-protein-lipid structure B)proteins form a continuous layer on the surface of the membrane C)the two dark layers visible in the electron microscope are lipid layers D)lipids cannot move laterally within the bilayer E)proteins form different patterns on the bilayer that vary from time to time and place to place 这题我选A，但有对答到答案是B的，不太确定 2.A symporter is a carrier protein in which the transport of one solute: A)occurs through a channel B)occurs without the simultaneous transport of another solute C)depends on the transport of another solute in the opposite direction D)depends on the transport of another solute in the same direction E)depends on the opening of a ''gate'' in the carrier protein 此题我觉得是D，但不确定 3.A hydrophobic portion of a substrate molecule would most likely fit into a _____ region of its enzyme's active site A)positively charged B)negatively charged C)hydrophilic D)hydrophobic E)polar 这题我选E 4.In the electron transport chain,quinone molecules shuttle protons from the__ into the ____ A)cytosol;intermembrane space B)intermembrane space;cytosol C)outer membrane;inner membrane D)matrix;intermembrane space E)intermembrane space;matrix 5.Cytoplasmic inheritance in plants involves genes present in the: A)cytosol only B)plastids only C)mitochondria only D)cytosol and plastids E)mitochondria and plastids 此题我选C 6.Homologous chromosomes pair up during: A)prophaseⅠ B)prophaseⅡ C)metaphaseⅠ D)metaphaseⅡ E)telophaseⅠ 我觉得A跟C都对，因减数分裂中期後，同源染色体才分开，但这是单选题，所以要 选哪一个选项较好呢 新手上路～还请各位多多见谅～也恳请指教罗！ --

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