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The main organelle involved in modification and routing of newly synthesized proteins to their destinations is

1. chloroplast
2. mitochondria
3. lysosome
4. endoplasmic Reticulum

Correct answer: endoplasmic Reticulum

Solution

The endoplasmic reticulum, especially the rough ER, is the main site where newly synthesized proteins are folded, modified, and prepared for transport. It helps route them to the Golgi apparatus and then to their final destinations.

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