题干

2014年9月10号新闻晨报报道,肿痘凋亡“绿色通道”成功打通,核心物质β﹣1,3﹣D﹣葡聚糖具有强烈抗肿瘤活性,可诱导肿瘤细胞分化或凋亡.下列有关说法正确的是(  )

A:细胞癌变时,抑癌基因发生了突变,原癌基因未发生突变

B:癌细胞在患者体内容易分散和转移,与细胞膜上糖蛋白异常有关

C:β—1.3—D﹣葡聚糖诱导肿瘤细胞凋亡时,只有凋亡基因表达

D:肿瘤细胞始终处于细胞分裂期,且分裂期比正常细胞短

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答案(点此获取答案解析)

B

同类题1

阅读下面短文, 从短文后各题所给的四个选项(A、B、C、D)中, 选出可以填入空白处的最佳选项。
    Once there was a millionaire, who got a serious eye irritation(发炎). He got a famous doctor to 1 his eyes. The doctor advised him to 2 bright light for one month so he could recover naturally. Immediately the rich man 3 all his windows and replaced all the bright and colorful curtains with dull cloth. He also 4 all the bright chandeliers(枝形吊灯). In one word, he made all his house 5.
    One month later, the doctor paid a visit to the millionaire to ask about the 6 of his eyes. To the doctor's 7, everything in the house had been made dark and dull. Then the doctor said, “You should have bought a pair of 8 to protect your eye from bright light 9 spending so much money on all these things to make your house darker.”
    The same phenomenon(现象) 10 all of us. We often see many 11 in others. We are very 12 to change the attitude and behavior of others which doesn't 13 our own.
    We have many likes and dislikes. 14 other people also have. But we are often interested in imposing(把......强加于) our opinion and thinking on others, 15 we never made any error. Accordingly we want to 16 this world with our own rules and theory.
    However, we 17 that other people who share this world equally with us also think in a similar way and 18 us to behave according to their wishes. Then who 19 your thinking? In order to bring about certain change in the people around us, first it is “we” that have to change.
    20, any needed change can happen when it starts with us.