β-内酰胺类抗生素的作用机制是 - 查题网

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高等继续教育 / 药物化学

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题型描述: 单选题
β-内酰胺类抗生素的作用机制是
A.抑制粘肽转肽酶的活性，阻止细胞壁的合成
B.干扰细菌蛋白质的合成
C.影响细胞膜的渗透性
D.干扰核酸的复制和转录

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药物化学

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题干二、完型填空（每空10分）。操作提示：通过题目中的下拉选项框选择恰当的词语补全填空。 Joachim's vision is based on an idea called pleaching (编织), where tree branches are grown so that they naturally weave together. Since the growth patterns of trees are 回答effectedaffectedattempted正确获得10.00分中的10.00分 by wind and sunlight, it may be possible to control the way a tree develops. These Fabricated Tree House Habitats would use trees grown into shapes as housing. One of the 回答purposesdisadvantagesadvantages不正确获得10.00分中的0.00分 of these designs is that trees would not have to be cut down for lumber. "A 100 percent treehouse would take years to create," Joachim said．回答Depending onJudging byProtected from正确获得10.00分中的10.00分 the climate, a house could take anywhere from 5 to 30 years to grow. Fortunately, there's a way to speed up the process. Joachim suggests including ecological materials such as sod (草皮), grasses and living branches in the housing designs. "This material would be able to move as the house grows," Joachim said． A home would become an actual ecosystem, a community of plants, animals, and bacteria working together. The trees would also give off water vapor that would assist in 回答cleaningheatingcooling正确获得10.00分中的10.00分 the homes. Solar panels and wind would help provide energy. The tree homes might even have soil pockets, where plants could grow from the structure itself. Work has already begun on Joachim's first design—a house made from 50 percent recycled and 50 percent living things. Joachim is confident about the 回答happinessbenefitimportance正确获得10.00分中的10.00分 of his work, as he uses natural products without destroying nature. "The environment and its study are very important. We need to respect nature, don't take it for granted," he said．管理英语3