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How does the ethylene signaling pathway work in plant cells?A.
In the absence of ethylene, the receptor directly activates an associated protein kinase, which then indirectly promotes the destruction of the transcription regulator that switches on ethyleneresponsive genes. As a result, the genes remain turned off.
B.
In the presence of ethylene, the receptor and kinase are both inactive, and the transcription regulator remains intact and stimulates the transcription of the ethylene-responsive genes.
C.
The kinase that ethylene receptors interact with is a serine/threonine kinase that is closely related to the MAP kinase kinase kinase found in animal cells.
D.
The ethylene receptor is located in the endoplasmic reticulum; because ethylene is hydrophobic, it passes easily into the cell interior to reach its receptor.
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【简答题】植物细胞细胞壁通常可分为 3 层,分别为( )、( )和( )。
【简答题】高等植物细胞壁的主要成分为多糖,包括 、 、 。不同细胞的细胞壁还可能添加木质素、角质、木栓质和蜡质等。
【简答题】植物细胞壁可分为_______ 、_______ 和_______等三层。
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