题干

结合以下图表分析,有关说法正确的是(  )
抗菌药物
青霉素
环丙沙星
红霉素
利福平
抗菌机理
抑制细菌细胞壁的合成
抑制细菌DNA解旋酶的活性(可促进DNA螺旋化)
能与核糖体结合,阻止了其与RNA结合
抑制RNA聚合酶的活性

A:①~⑤可发生在人体健康细胞中

B:青霉素和利福平能抑制DNA的复制

C:结核杆菌的④和⑤都发生在细胞质中

D:环丙沙星、利福平和红霉素分别能抑制细菌的①②和③过程

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答案(点此获取答案解析)

D

同类题5

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     People know the dangers of fires. It's good for a family to learn how to prepare for a fire. Here are some suggestions. 

     Put a smoke alarm in the house. Smoke from a fire cause the alarm to go off. The alarm makes a loud sound. The sound tells everyone to leave the house at once. 

     Make escape(逃脱)plans. Everyone should know all the ways out of the house. If there is a fire, everyone follows the plan to get out. Part of the plan is to check all the windows to make sure they can be opened easily. 

      Buy fire extinguishers(灭火器)in the house. Everyone in the family should know how to use them. 

      Practise for a fire. They do fire practise because they teach children about fire safety. 

      Everyone in the family should know the following fire rules:

        ★Don't open a hot door! The fire can grow more quickly if you open the door. 

        ★Stay close to the floor! Smoke can be more dangerous than fire. The best air is near the floor because smoke rises. 

        ★What will you do if your hair or clothes start to burn? First, stop! Don't run! The fire burns faster because of more air. Drop! Fall to the floor. Then roll! Turning over and over will make the fire go out. Put a blanket(毯子)around you to keep air away from the fire that may still be on you. 

     There are many possible causes for fires. A wise(明智的)family is ready all the time. If there is a fire, don't forget to call 119 for help.