Science Enhanced S&S Biology

The presence of ribosomes distinguishes two categories of endoplasmic reticulum. Smooth endoplasmic reticulum (SER) has no protein-producing ribosomes on its surface. Rough endoplasmic reticulum (RER), like the SER, is formed by a network of internal membranes. The membranes of the RER, however, form a series of flattened sheets connected by ... ................
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