Which cell organelle is not bound by a cell membrane? (RJ AARO Botany 2014)

✅Explanation: Ribosomes:
-Responsible for protein synthesis
-Not enclosed by a membrane
-Composed of RNA and protein, existing freely in the cytoplasm or attached to the endoplasmic reticulum

📌Other Options Explanations:
-Lysosome: Membrane-bound organelle containing enzymes for breaking down cellular waste
-Spherosome: Membrane-bound organelle involved in lipid storage and metabolism
-Peroxisome: Membrane-bound organelle playing a role in various metabolic processes

🔑Key Points::
-Eukaryotic cells: Characterized by the presence of membrane-bound organelles
-Prokaryotic cells: Lack membrane-bound organelles
-Membrane-bound organelles: Include the nucleus, endoplasmic reticulum, Golgi apparatus, mitochondria, and plastids