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#membrane-bound organelles

4 public questions tagged with this topic.

Cell Organelles

Which of the following is a membrane-bound organelle?

Eukaryotic cytoplasm contains membrane-bound and non-membrane organelles distinguished by presence of phospholipid bilayer enclosing aqueous compartment that allows compositional specialization. Ribosomes are 80S megaDalton protein-RNA assemblies consisting of small and large subunits that translate mRNA in cytosol or on rough endoplasmic reticulum, lacking membrane and exchanging subunits dynamically. Nucleolus is membraneless nuclear subdomain formed by liquid-liquid phase separation around rDNA repeats for ribosome biogenesis. Centrosome comprises two centrioles surrounded by pericentriolar

Ref: Alberts et al., Molecular Biology of the Cell, 6th ed., Chapter 12: Peroxisomes as Single Membrane-Bound Organelles.

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Cell Organelles

Which of the following is not membrane-bound?

Membrane-bound organelles derive from endomembrane system involving lipid bilayers enclosing aqueous lumen, including nucleus surrounded by double membrane perforated by pores, mitochondria with outer and inner membranes supporting oxidative phosphorylation, endoplasmic reticulum network, Golgi stacks and lysosomes that are acidic hydrolase containing vesicles. Ribosomes represent exception being ribonucleoprotein particles approximately twenty five to thirty nanometers composed of ribosomal RNA and seventy to eighty proteins without delimiting membrane. Free cytosolic ribosomes translate cyto

Ref: Alberts Ch 12; ribosomes non-membranous RNPs 25-30nm, free and rough ER bound, no lipid bilayer.

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