第3题
Which of the following distinguishes the constitutive secretory pathway from the regulated secretory pathway?( )
A.Proteins of the constitutive pathway are synthesized in larger precursor forms
B.Constitutive vesicles are secreted selectively only during development
C.Secretion is signal independent in the constitutive pathway
D.Only constitutive vesicles derive from the trans Golgi network(TGN)
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