题干

将酵母菌培养液进行离心处理。把沉淀的酵母菌破碎后,再次离心处理为只含有酵母菌细胞质基质的上清液和只含有酵母菌细胞器的沉淀物两部分,与未离心处理过的酵母菌培养液分别放入甲、乙、丙三个试管中,并向这三个试管内同时滴入等量、等浓度的葡萄糖溶液。在有氧的条件下,最终能通过细胞呼吸产生C02和H20的试管是(    )

A:甲

B:丙

C:甲和乙

D:丙和乙

上一题 下一题 0.0难度 选择题 更新时间:2019-05-28 01:43:30

答案(点此获取答案解析)

B

同类题5

阅读短文,从每题所给四个选项(A、B、C和D)中选出最佳选项。

Gao Xinyi, 14, No 1 Middle School Affliated in CCNU Chao Yang School, Beijing

I was once asked to give a speech in English in front of several native speakers at an organization last summer. I was asked to talk about my experience. At the beginning, I explained to the organizers that I was afraid to speak without preparation. But they told me that I had better get over it. When I first stood up in front of the crowd, my mind went completely blank. But then I began to talk about my story and used some gestures and facial expressions. Although I didn't speak very well, I still did it.

Ye Tong, 14, Hangzhou Entel Foreign Language School, Zhejiang

    To be honest, I wasn't a brave girl. I still slept with my mother until I was a sixth-grader, because I didn't dare to sleep alone. Last year, one evening after I came back from school, my mom asked me to sleep in my own room. I thought I had grown up, so I should learn to be independent. Though I was frightened at first, I slept in my own room for the first time. I did it. I'm really proud of myself! This is the bravest thing I have ever done.

Zhang Yiyi, 14, Taiyuan Foreign Language School, Shanxi

I didn't dare to ride the roller coaster all the time. I thought it was a terrible thing. However, my friend asked me to try it when we were in Disneyland, in Hong Kong last year. I decided to take a try. It took off so fast. It was a cool feeling, like you were flying! That was extremely good fun. Someone once said, "Life is a roller coaster ride, tighten your seat belts, enjoy the journey, remember the up always has a down." That is right. I have fallen in love with the roller coaster.