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【单选题】
关于开放型活性染色质结构对转录的影响下列哪种说法是不正确的A.
间期核中,伸展且呈透明状态的为常染色质,卷曲凝缩的为异染色质
B.
基因的活跃转录是在异染色质上进行的
C.
处于活跃状态的基因多为DNA酶I超敏感位点
D.
灯刷型染色体上的环形结构可能与基因的活性转录有关
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举一反三
【单选题】I have told him several times that these young pines ______ watering twice a week.
A.
require
B.
appeal
C.
demand
D.
request
【单选题】I paid __ money that I borrowed from him there years ago.
A.
twice as many as
B.
twice the size of
C.
twice the amount of
D.
more than twice
【单选题】千斤顶属于( )螺旋传动形式。
A.
螺母固定，螺杆旋转并移动
B.
螺母轴向固定但旋转，螺杆轴向移动
C.
螺杆固定，螺母旋转并移动
D.
螺杆轴向固定但旋转，螺母移动
【单选题】— I telephoned him twice and I couldn’t get through to him. —The line might have been out of order, _______?
A.
don’t you
B.
wasn’t it
C.
do you
D.
hadn’t it
【单选题】—I telephoned him twice and I couldn’t get through to his home. —I think the line might have been out of order, ________?
A.
don’t you
B.
wasn’t it
C.
do you
D.
hadn’t it
【单选题】女性, 62 岁,最近发现乳房有一肿块直径约1厘米直径质硬,表面不光滑,与皮肤及深部组织无粘连,初步诊断是
A.
纤维腺瘤
B.
乳管内乳头状瘤
C.
乳房结核
D.
乳癌
E.
乳房囊性增生病
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