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Endoplasmic reticulum — protein synthesis particles
publish date: 2026/06/16 20:56:44.719009 UTC
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Endoplasmic reticulum may occur with and without being lined with small particles that are the actual sites of protein synthesis. What are these particles called?
Correct Answer
ribosomes
Explanation
Ribosomes are the small particles that line the rough endoplasmic reticulum and serve as the actual sites of protein synthesis. They read messenger RNA (mRNA) and assemble amino acids into polypeptide chains. Ribosomes can also be found free in the cytoplasm or grouped in clusters called polysomes (polyribosomes).
Reference
Biology: A Self-Teaching Guide