细菌没有真正的细胞核.______.
细菌的结构有细胞壁、细胞膜、细胞质、遗传物质等结构,虽没有成形的细胞核,但是遗传物质同样能传递遗传信息.
故答案为:√
191. Things went well for him during his early life but in middle age his__________seemed to change.
A.chance
B.success
C.way
D.Luck
下列现象属于液化现象的是( )
A.夏天,装有冰水的杯子外表面会“出汗”
B.电灯泡用久了会变黑
C.冰雪消融
D.结冰的衣服会变干