Which of the following pathways is involved in packaging of secretory proteins?

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RER $\to$ Trans face of Golgi body $\to$ Cis face of Golgi body $\to$ Secretory vesicles

Trans face of Golgi body $\to$ Cis face of Golgi body $\to$ RER $\to$ SER $\to$ Secretory vesicles

RER $\to$ Cis face of Golgi body $\to$ Trans face of Golgi body $\to$ Secretory vesicles

Cis face of Golgi body $\to$ Trans face of Golgi body $\to$ RER $\to$ Secretory vesicles

answer is B.

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Detailed Solution

RER → Cis face of Golgi body → Trans face of Golgi body → Secretory vesicles
The proteins are synthesised in the RER. Materials to be packaged in the form of vesicles from the ER fuse with the cis face of the Golgi apparatus and move towards the maturing face. Ultimately, the modified proteins are released from the trans face in the form of secretory vesicles.
(1) The proteins are transported from ER to GB and not vice-versa.
(3) The proteins are transported from ER to GB and not vice-versa.
(4) Cis is the forming face and trans is the maturing face.

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