The nuclear envelope originates from which of the following?

The network of tubular structures scattered throughout the cytoplasm is known as:

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

The Golgi apparatus receives materials from which of the following organelles?

Rough Endoplasmic Reticulum $(RER)$ $= ..........P.............$
Smooth Endoplasmic Reticulum $(SER)$ $= ......Q...........$
What substances do the above Endoplasmic Reticula synthesize/secrete respectively?

The network of tiny tubular structures scattered in the cytoplasm is called $..........$.