【单选题】电阻点焊的焊接电流大时,焊点中间电极触头接触部分的颜色变深呈()。
【简答题】粗面内质网(rough endoplasmic reticulLlm,rER)
【多选题】资金成本在企业筹资决策中的主要作用有( )。
【简答题】RER可合成脂类,SER可合成蛋白质。( )
【单选题】外源有毒物质或内源代谢有毒产物大多数在( )细胞的( )中进行。
【单选题】The signal peptidase residing in the lumen face of RER membrane is to _______.
A.
cleave off the protein synthesized on RER membrane.
B.
cleave off the N-terminal signal sequence of the protein being synthesized.
C.
.cleave off the internal signal sequence of the protein being synthesized.
D.
cleave off the stop transfer signal sequence of the protein being synthesized.
【单选题】RER膜上有( ),它是RER上的整合蛋白,由α亚基(69KDa)、β亚基(30KDa)组成。