NEETBotanyCell - The Unit of Life
Identify the correct chronological sequence of structures a newly synthesized secretory protein passes through from its synthesis to exocytosis: (A) trans face of Golgi (B) Rough Endoplasmic Reticulum (C) Secretory vesicle (D) cis face of Golgi (E) Plasma membrane Choose the correct answer from the options given below:
Options
- A(B) (A) (D) (C) (E)
- B(B) (C) (D) (A) (E)
- C(D) (B) (A) (C) (E)
- D(B) (D) (A) (C) (E)
Correct answer
D. (B) (D) (A) (C) (E)
Step-by-step solution
Proteins destined for secretion are synthesised by ribosomes on the Rough Endoplasmic Reticulum (B). They are packaged into transitional vesicles that fuse with the convex cis face of the Golgi apparatus (D). These proteins are modified as they move through the Golgi cisternae and are released from the concave trans face (A). After release, they are packaged into secretory vesicles (C) which eventually fuse with the plasma membrane (E) to release their contents outside the cell via exocytosis. Thus, the correct seq