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some secretary cells synthesize and rele...

some secretary cells synthesize and release glycoproteins. What is the correct order of the sequence of events as they occur in the secretory cell?
I . Exocytosis
II. Product accumulates in secretory vesicle
III. mRNA binds to ribosomes
IV. Synthesis of glycoprotein

A

III, IV ,I , II

B

III,IV ,II, I

C

IV,III,I,II

D

IV,III,II,I

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct order of events in the synthesis and release of glycoproteins by secretory cells, we need to analyze the steps involved in this process. Here is the step-by-step solution: ### Step-by-Step Solution: 1. **mRNA Binds to Ribosomes (Step III)**: - The process begins when messenger RNA (mRNA) binds to ribosomes in the cytoplasm. This is the first step in the synthesis of proteins, including glycoproteins. 2. **Synthesis of Glycoprotein (Step IV)**: - Once the mRNA is bound to the ribosomes, the ribosomes translate the mRNA sequence into a polypeptide chain, which will fold and undergo post-translational modifications to become a glycoprotein. 3. **Product Accumulates in Secretory Vesicle (Step II)**: - After the glycoprotein is synthesized, it is packaged into secretory vesicles. These vesicles accumulate the glycoprotein until it is ready to be secreted. 4. **Exocytosis (Step I)**: - Finally, when the secretory vesicles are full and the cell is ready to release the glycoprotein, the vesicles fuse with the plasma membrane, and the glycoprotein is released outside the cell through a process called exocytosis. ### Correct Order of Events: - III (mRNA binds to ribosomes) - IV (Synthesis of glycoprotein) - II (Product accumulates in secretory vesicle) - I (Exocytosis) Thus, the correct sequence of events is: **III → IV → II → I**.
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