Membrane-bound

Referring to a biological structure, especially organelles or molecules, that are enclosed within a cellular membrane. This membrane acts as a barrier, separating the internal environment from the external, and controlling the passage of substances. membrane-bound structures are crucial for compartmentalization within cells, allowing for specialized functions and reactions to occur in distinct locations. These structures often have specific protein components within the membrane to facilitate transport and other interactions. The term emphasizes the confinement of the entity within a phospholipid bilayer membrane, highlighting its independence and functional role within the cell.

Membrane-bound meaning with examples

• The endoplasmic reticulum, a membrane-bound organelle, synthesizes and transports proteins and lipids throughout the cell. Its extensive network of interconnected sacs and tubules is crucial for many cellular processes.
• Lysosomes, membrane-bound organelles containing digestive enzymes, break down cellular waste and debris. The membrane prevents these enzymes from harming the rest of the cell.
• During protein synthesis, ribosomes attach to the membrane-bound rough endoplasmic reticulum, ensuring proper folding and processing of the synthesized proteins.
• Vesicles, small membrane-bound sacs, transport substances like proteins and lipids between different organelles and the cell membrane in a highly controlled manner.