Which one is not a true organelle?Group of answer choicesribosomelysosomemitochondrionsmooth ERnucleus

To determine which option is not a true organelle, we need to analyze each option in terms of whether it has a membrane-bound structure or not.

1. Ribosome: Ribosomes are not membrane-bound and are considered non-membrane organelles. They are cellular structures involved in protein synthesis.

2. Lysosome: Lysosomes are membrane-bound organelles that contain digestive enzymes to break down waste materials and cellular debris.

3. Mitochondrion: Mitochondria are membrane-bound organelles known as the powerhouses of the cell, where energy production occurs.

4. Smooth Endoplasmic Reticulum (Smooth ER): The Smooth ER is a membrane-bound organelle involved in lipid synthesis and detoxification processes.

5. Nucleus: The nucleus is a membrane-bound organelle that contains the cell’s genetic material and regulates gene expression.

Final Answer

Ribosome is not a true organelle because it is not membrane-bound.