You are examining a tissue sample under an electron microscope. You notice that the endoplasmic reticulum
(ER) of each cell in this
tissue is extremely rough
in
appearance and very extensive (occupies most of the
cytoplasm). You know that the rough appearance of ER is
because of the ribosomes embedded on the ER surface.
What is the most logical explanation for the extensive
rough ER and unusually high number of ribosomes
associated with it?