问题 名词解释

scaffold (染色体骨架)

答案

参考答案:

在染色体包装时,为染色质提供锚定位点的非组蛋白。为了证明染色体骨架的存在,分离有丝分裂前的染色体,接着用试剂溶解组蛋白和大多数主要的非组蛋白,然后在电子显微镜下观察可见一完整的染色体结构框架(framework)或支架(scaffold)。在间期,染色体支架解体,而构成支架的蛋白则作为核基质的组成部分起作用。

多项选择题
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My parents were in a huge argument, and I was really upset about it. I didn’t know who I should talk with about how I was feeling. So I asked Mom to allow me to stay the night at my best friend’s house. Though I knew I wouldn’t tell her about my parents’ situation, I was looking forward to getting out of the house. I was in the middle of packing up my things when suddenly the power went out in the neighborhood. Mom came to tell me that I should stay with my grandpa until the power came back on.

I was really disappointed because I felt that we did not have much to talk about. But I knew he would be frightened alone in the dark. I went to his room and told him that I’d stay with him until the power was restored. He was quite happy and said, “Great opportunity(机会)”

“ What is ?” I asked.

“ To talk, you and I,” he said. “To hold a private little meeting about what we’re going to do with your mom and dad, and what we’re going to do with ourselves now that we’re in the situation we are in.”

“But we can’t do anything about it, Grandpa,” I said, surprised that here was someone with whom I could share my feelings and someone who was in the same “boat” as I was.

And that’s how the most unbelievable friendship between my grandfather and me started. Sitting there in the dark, we talked about our feelings and fears of life—from how fast things change, to how they sometimes don’t change fast enough. That night, because the power went out, I found a new friend, with whom I could safely talk about all my fears and pains, whatever they may be.

Suddenly, the lights all came back on. “Well,” he said, “ I guess that means you’ll want to go now. I really like our talk. I hope the power will go out every few nights!”

小题1: I wished to get out of the house because ______________

A.I was angry about my parents’ quarrel(争吵)

B.I found nobody to share my feelings with

C.I wanted to escape from the dark house

D.I planned to tell my friend about my trouble小题2:Grandpa was happy to see me because _____________

A.he could discuss the problem with me

B.he had not seen me for a long time

C.he was afraid of darkness

D.he felt quite lonely小题3:What can be inferred from the passage?

A.The grandchild was eager to leave.

B.They would have more chats.

C.The lights would go out again.

D.It would no longer be dark.