【单选题】(2007. 天津)在横线处填入短语,顺序最恰当的一项是:( )保护动物,已不是人们陌生的话题。人类的发展,也早已达到可以把其它动物玩弄于掌中并主宰它们命运的程度,但当 、 、 、 的时候,人类真正考虑过动物和人在生命意义上的平等吗?1老虎服服帖帖在舞台上表演;2用于实验的动物为科学献身3兔子、小鸡成为孩子们的玩物;4耕作的动物在田间地头劳作。
【单选题】10 女性,49岁,大便次数增加、 带血3个月,3-6次/天,不成形,间断带暗红色血迹。有中、下腹痛。近来明显乏力,体重下降约4kg。既往体健,家族中无类似疾病患者。查体:T37.2°C,P78次/分,R18次/分,BP120/80mmHg,一般状况稍差,右下腹似可及约4×8cm,质韧包块,可推动,边界不清,移动性浊音(-),肠鸣音大致正常,直肠指诊未及异常。实验室检查:大便潜血(+),血常规WB...
【单选题】下列关于流水施工组织方式叙述不正确的是( )。
A.
流水施工方式单位时间内投入的资源量较为均匀,便于资源供应的组织
B.
施工现场的管理和组织最为简单的施工方式为平行施工
D.
流水施工中各工作队实现了专业化施工,也为文明施工和科学管理创造了有利条件
【简答题】翻译:light-induced degradation
【单选题】下列关于子宫腺肌病描述正确的是
B.
子宫腺肌病与子宫内膜异位症在组织发生学上是一致的
【简答题】女性,49岁,大便次数增加、带血3个月3月前无明显诱因,排便次数增多,3-6次/天,不成形,间断带暗红色血迹。有中、下腹痛,无明显腹胀及恶心呕吐。无发热,进食可。近来明显乏力,体重下降约4kg。为进一步诊治收入院。既往体健,家族中无类似疾病患者。查体:T37.2℃,P78次/分,R18次/分,BP120/80mmHg一般状况稍差,皮肤无黄染,结膜苍白,浅表淋巴结未及肿大。心肺无明确病变。腹平坦,未...
【单选题】transfrom:skew(30deg,20deg)实现了什么效果
【单选题】下列关于施工组织方式的叙述 , 不正确的是
【多选题】How does the light-induced signaling cascade in rod photoreceptor cells greatly amplify the light signal?
A.
When rod photoreceptors are adapted for dim light, the signal amplification is enormous. The cascade functions as follows. In the absence of a light signal, the second messenger molecule cyclic GMP is continuously produced by guanylyl cyclase in the cytosol of the photoreceptor cell.
B.
The cyclic GMP then binds to cation channels in the photoreceptor cell plasma membrane, keeping them open. Activation of rhodopsin by light results in the activation of transducin α subunits.
C.
These turn on an enzyme called cyclic GMP phosphodiesterase, which breaks down cyclic GMP to GMP (much as cyclic AMP phosphodiesterase breaks down cyclic AMP). The sharp fall in the cytosolic concentration of cyclic GMP reduces the amount of cyclic GMP bound to the cation channels, which therefore close.
D.
Closing these channels decreases the influx of Na + , thereby altering the voltage gradient (membrane potential) across the plasma membrane and, ultimately, the rate of neurotransmitter release .