Explanation
Ribosomes are not bounded by cell membrane. Ribosomes are the cellular structures responsible for protein synthesis, and they can be found either floating freely in the cytoplasm or attached to the endoplasmic reticulum. Unlike other organelles like mitochondria, lysosomes, and spherosomes, ribosomes are not surrounded by a membrane.
Mitochondria are bounded by two membranes and are responsible for cellular respiration and energy production.
Lysosomes are bounded by a single membrane and contain digestive enzymes for breaking down waste materials and foreign substances.
Spherosomes are small, spherical organelles bounded by a single membrane that are involved in lipid metabolism and energy storage.
