8. Which organelle is known as membranous organelles in cytoplasm? A. Microtubules B. Microfilaments C. Rough-surfaced endoplasmic reticulum (rER) D. Intermediate filaments

The correct answer is C. Rough-surfaced endoplasmic reticulum (rER). The rough-surfaced endoplasmic reticulum (rER) is a membranous organelle found in the cytoplasm of eukaryotic cells. It is characterized by the presence of ribosomes on its surface, which gives it a rough appearance. The rER is involved in protein synthesis and folding, as well as the transport of synthesized proteins within the cell.