服饰的TPO原则中，T是指

Which is the major regulator of proliferation and differentiation of megakaryocytes

A．erythropoietin

B．colony stimulating factors

C．granulocyte colony-stimuIating factor

D．interferon

E．thrombopoietin

正调控蛋白(positive regulator protein)

A、inverting amplifier

B、noninverting amplifier

C、oscillator

D、feedback regulator

cell type but a whole organ. A stunning example of such transcriptional control comes from studies of eye development in the fruit fly Drosophila. Here, a single transcription regulator called ____ triggers the differentiation of all of the specialized cell types that come together to form the eye. Flies with a mutation in this gene have no eyes at all, which is how the regulator was discovered. It is a master transcription regulator, which sits at the apex of the regulatory networks for the target genes.

A．Eye

B．Ey

C．Yes

D．Eys

A．Structural genes 结构基因

B．Promoter site 启动子区域

C．Operator site 操作子区域

D．Regulator gene 调节基因

Which of the following is NOT mentioned as a factor of accidents？

A．Mood.

B．Tiredness.

C．Carelessness.

D．Weather.