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【单选题】
启动一个动物受精卵形成胚胎所需要的信息预存在卵子发生期的卵母细胞里。果蝇幼虫和成虫的头-腹轴的发育由特定mRNA在卵母细胞中沿相同的前后轴向的定位所决定。例如,由Bicoid基因转录的mRNA优先定位在卵母细胞的前端,其编码的蛋白参与头部和胸部发育;而由Oskar基因转录的mRNA定位在后端,其编码的蛋白参与生殖细胞的形成。这个定位过程需要mRNA的3'-UTR上的特殊定位信号,微管帮助转运mRNA到到特定部位,微丝负责锚定已到达目的地的mRNA。下列叙述错误的是 ( )
A.
Biocoid基因和Oskar基因在果蝇中的表达说明基因表达具有空间特异性
B.
mRNA分子定位于细胞质的特殊区域属于转录水平的调控
C.
导致微的药物会破坏Bicoid mRNA在果蝇卵母细胞中的正常定位
D.
细胞质mRNA的定位普遍存在于具有极性的细胞中
E.
在可迁移的成纤维细胞中,激动蛋白mRNA主要定位在细胞边缘
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参考答案：
举一反三
【单选题】A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a _________.
A.
defective solenoid valve
B.
dirty fuel nozzle
C.
grounded high tension lead
D.
faulty ignition cable connector
查看完整题目与答案
【单选题】审美对象的核心是()
A.
美
B.
审美客体
C.
审美主体
D.
主观与客观
查看完整题目与答案
【多选题】客观精神说的核心观点:
A.
艺术是 “理念”或者客观“宇宙精神”的体现。
B.
艺术是 “自我意识的表现”，是“生命本体的冲动”。
C.
“文以载道”
查看完整题目与答案
【单选题】A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal .the probable ___.
A.
engine overload
B.
leaky valves
C.
stuck or broken piston rings
D.
low air injection pressure
查看完整题目与答案
【单选题】审美对象的核心是()。
A.
审美主体
B.
美
C.
审美客体
D.
主观与客观
查看完整题目与答案
【单选题】In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with ______.
A.
low firing pressure
B.
low exhaust temperature
C.
mechanical knock in each cylinder
D.
fuel knock in each cylinder
查看完整题目与答案
【单选题】High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by _____.
A.
engine overload
B.
low combustion temperature
C.
plugged fuel nozzle holes
D.
excessive compression pressure
查看完整题目与答案
【单选题】电子调谐器的最核心器件是 ( ) 。
A.
．三极管
B.
．电感
C.
．变容二极管
D.
．开关二极管
查看完整题目与答案
【单选题】When an auxiliary boiler is panting and emitting black smoke, you should _____.
A.
increase the fuel oil temperature
B.
decrease the fuel oil temperature
C.
decrease the fuel oil supply pressure
D.
increase the air supply
查看完整题目与答案
【单选题】Smog is something combined by smoke and fog. London is always known for its 'black fogs'. In the winter of 1952, a milky white fog rolled into the city. It soon turned into black smog as the smoke of ...
A.
smoke and fumes
B.
snow
C.
water drops
D.
fog
查看完整题目与答案
相关题目：
【单选题】A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a _________.
A.
defective solenoid valve
B.
dirty fuel nozzle
C.
grounded high tension lead
D.
faulty ignition cable connector
查看完整题目与答案
【单选题】审美对象的核心是()
A.
美
B.
审美客体
C.
审美主体
D.
主观与客观
查看完整题目与答案
【多选题】客观精神说的核心观点:
A.
艺术是 “理念”或者客观“宇宙精神”的体现。
B.
艺术是 “自我意识的表现”，是“生命本体的冲动”。
C.
“文以载道”
查看完整题目与答案
【单选题】A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal .the probable ___.
A.
engine overload
B.
leaky valves
C.
stuck or broken piston rings
D.
low air injection pressure
查看完整题目与答案
【单选题】审美对象的核心是()。
A.
审美主体
B.
美
C.
审美客体
D.
主观与客观
查看完整题目与答案
【单选题】In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with ______.
A.
low firing pressure
B.
low exhaust temperature
C.
mechanical knock in each cylinder
D.
fuel knock in each cylinder
查看完整题目与答案
【单选题】High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by _____.
A.
engine overload
B.
low combustion temperature
C.
plugged fuel nozzle holes
D.
excessive compression pressure
查看完整题目与答案
【单选题】电子调谐器的最核心器件是 ( ) 。
A.
．三极管
B.
．电感
C.
．变容二极管
D.
．开关二极管
查看完整题目与答案
【单选题】When an auxiliary boiler is panting and emitting black smoke, you should _____.
A.
increase the fuel oil temperature
B.
decrease the fuel oil temperature
C.
decrease the fuel oil supply pressure
D.
increase the air supply
查看完整题目与答案
【单选题】Smog is something combined by smoke and fog. London is always known for its 'black fogs'. In the winter of 1952, a milky white fog rolled into the city. It soon turned into black smog as the smoke of ...
A.
smoke and fumes
B.
snow
C.
water drops
D.
fog
查看完整题目与答案
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