Are organelles without membrane present? Comment.
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Yes, non-membrane-bound organelles exist and include:
- Ribosomes:
- Found in prokaryotes (70S) and eukaryotes (80S)
- Also present in mitochondria and chloroplasts (70S type)
- Composed of rRNA and ribosomal proteins
- Function: Protein synthesis
- Centrioles:
- Present in animal cells and some lower plant groups
- Composed of nine triplet microtubules (9+0 arrangement)
- Function: Spindle fiber formation, basal body for cilia/flagella
These organelles lack surrounding membranes but are essential for cellular metabolism and structural organization.
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