Which are the more abundant ribosomes in secretory cells - the free cytoplasmic ribosomes or those associated with the rough endoplasmic reticulum?

Describe the major functions of the endoplasmicreticulum, Golgi complex, and lysosomes.

The endoplasmic reticulum (ER) and Golgi apparatus are two organelles that are not physically joined, yet materials can still be exchanged between them. How can materials, such as proteins, move between the ER and Golgi when these organelles are not touching each other? A) When a substance such as a protein needs to move between these organelles, it is first dismantled in one organelle, then reassembled when it arrives at the other organelle. B) Substances such as proteins can travel between these organelles within transport vesicles. C) None of these; a single molecule will not go from one organelle to another. D) Substances like proteins will move between these organelles by diffusion through the cytoplasm. ..

Of which structures is the nuclear membrane composed?