问题 名词解释

cell communication (细胞通讯)

答案

参考答案:

细胞通讯是指在多细胞生物的细胞社会中,细胞间或细胞内通过高度精确和高效地发送与接收信息的通讯机制,并通过放大引起快速的细胞生理反应,或者引起基因活动,尔后发生一系列的细胞生理活动来协调各组织活动,使之成为生命的统一整体对多变的外界环境作出综合反应。

多细胞生物是由不同类型的细胞组成的社会,而且是一个开放的社会,这个社会中的单个细胞间必须协调它们的行为,为此,细胞建立通讯联络是必需的。

阅读理解
阅读理解。根据卡片内容,判断正(T)误(F)。
    My four friends talked about their weekends. And they wrote something on these cards.
    I stayed at home and studied over the weekend. I studied for my English course on Saturday.
Yesterday I wrote a history paper (考卷). In the evening I talked to my pen pal on the phone.
What did you do?
                                                                                                                                Judy
    I had a good time. On Saturday morning I played tennis, in the afternoon I went to the zoo,
and in the evening I went to Nancy's birthday party. On Sunday I went to the mountain with my
friend. 
                                                                                                                                Tim
    Oh, your weekend was great. But mine was boring. I stayed at home the whole weekend. I
cleaned my room and washed my clothes. I helped my mother do some housework. Did you
go out?
                                                                                                                                Mary
    No, I didn't. I stayed at home and watched TV on Saturday. Yesterday I watched a movie,
Last Blue Ballet. It was very exciting. 
                                                                                                                                Dave
( ) 1. Tim went to the zoo last weekend.
(     ) 2. Mary washed the clothes last weekend.
(     ) 3. On Sunday night, Judy watched a movie, Last Blue Ballet.
( ) 4. Dave played tennis last weekend.
(     ) 5. In the evening , Judy talked to her pen pal on the phone.
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