问题
单项选择题 A1/A2型题
与核糖体50S亚基结合，抑制肽酰基转移酶的药物是（）
A.青霉素
B.链霉素
C.红霉素
D.四环素
E.氯霉素
答案
参考答案：E
解析：氯霉素的作用机制是通过与细菌核蛋白体50S亚基结合，抑制肽酰基转移酶，而阻止肽链延伸，使蛋白质合成受阻，所以答案为E。
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与核糖体50S亚基结合，抑制肽酰基转移酶的药物是（）
A.青霉素
B.链霉素
C.红霉素
D.四环素
E.氯霉素
参考答案：E
解析：氯霉素的作用机制是通过与细菌核蛋白体50S亚基结合，抑制肽酰基转移酶，而阻止肽链延伸，使蛋白质合成受阻，所以答案为E。
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o'clock. He brushes (刷) his teeth (3)______ eats breakfast. After breakfast he plays his guitar. Then he goes to see his grandfather (4)______ his parents. They (5)______ some fruit for his grandfather. His grandfather is very (6)______ to see them. They have lunch together (一起). (7)______ the afternoon Mike goes to the basketball club. There he plays basketball for (8)______ hour (小时). Mike (9)______ home at five o'clock. At five thirty he eats dinner. Mike goes to bed at ten thirty. This is Mike's (10)______. |