题目内容
全能干细胞能够让植物在整个生命周期中产生新的器官,是植物生长发育的源泉和信号调控中心,但是到目前为止,人们对于干细胞组织中心建立和维持的机制仍然知之甚少。中国科学院遗传与发育生物学研究所的李传友课题小组发现了一个在植物根尖干细胞维持中起重要作用的基因,这一研究结果于2010年11月3日作为封面文章发表于国际著名杂志The Plant Cell上。下列说法不正确的是
A.植物全能干细胞分化形成不同组织细胞是基因选择性表达的结果
B.植物全能干细胞有细胞周期,全能干细胞分化形成的导管细胞没有细胞周期
C.植物全能干细胞分化形成根、茎、叶的过程一般是不可逆的
D.植物全能干细胞分化形成根、茎、叶的过程体现了细胞的全能性
读程序,说明程序运行的结果.
(1)INPUT
INPUT
PRINT
END
(2)INPUT
The man went into the room, _____ rather strange.
A. to look B. looking C. looked D. and looking
There _____ a lot of coal mines in the south, but many of them have been closed or are _____ be closed.
A. use to having; about to B. used to be; to
C. use to having; going to D. used to be; supposed to
We are just _____ calling you up _____ you come in.
A. about; when B. on the point of; while
C. on the point of; when D. on the point of; as
The shopkeeper did not want to sell for he thought was not enough.
A.where B.how C.what D.which