下列有关原核生物与真核生物的说法，正确的是_刷题宝

题干

下列有关原核生物与真核生物的说法，正确的是（）

A：蓝藻无叶绿体，但能进行光合作用

B：酵母菌、醋酸菌和HIV都具有细胞壁、核糖体、DNA和RNA

C：蓝藻细胞具有细胞核且DNA分子呈环状

D：酵母菌有细胞膜，而细菌没有

上一题下一题 0.0难度选择题更新时间:2015-05-07 03:06:30

答案(点此获取答案解析）

A

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给试管内的液体加热，下列操作中正确的是（）

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小明自制了一支密度计，将其分别放入盛有两种不同液体的甲、乙两个容器中，静止时，如图所示，若两种液体的密度分别为ρ_甲和ρ_乙，从观察到的现象可以判断：

ρ_甲____ρ_乙；该密度计排开液体的质量分别为m_甲、m_乙，则m_甲____m_乙（选填“＜”“=”或“＞”）。

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根据短文内容，完成下列各题。

A

This is my school. There are many trees and flowers in it. The classroom building is big and tall. There is a big playground in our school. It’s very nice to have it. After 4:30 in the afternoon, many students come to the playground to play football and some students play table tennis in the table tennis room, then they go home.

There are 1,000 students in 24 classes in our school. The students all like to study. The teachers in our school are very good. They help the students to study and sometimes play with them. All the students like them.

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