endomembrane system The hypothetical concept that the membranes of many apparently discrete cell structures are part of an interrelated system. It proposes that new membrane is constantly being made in the endoplasmic reticulum and transported, in the form of vesicles, to the various organelles. Hence, the membranes of the nucleus, endoplasmic reticulum, Golgi apparatus (or dictyosomes), plasma membrane, tonoplast, and outer (but not inner) membranes of the mitochondria and chloroplasts form a functional continuum within the cell.
More From encyclopedia.com
Cytoskeleton , The cytoskeleton is responsible for cell shape, motility (movement) of the cell as a whole, and motility of organelles within a cell. There are three… Cell , Cell The cell is the basic unit of a living organism. In multicellular organisms (organisms with more than one cell), a collection of cells that work… Microtubule , microtubule A tubular structure, 15–25 nm in diameter, of indefinite length, and composed of subunits of the protein tubulin. It occurs in large numb… Cells , Cells Plants are multicellular organisms composed of millions of plant cells. Although individual cells may differ greatly from each other in mature… Cell Membrane , cell membrane (plasmalemma, plasma membrane, protoplast) A sheet-like membrane, 7.5–10 nm thick, that forms a selectively permeable barrier enclosing… Protozoan , protozoan (prō´təzō´ən), informal term for the unicellular heterotrophs of the kingdom Protista. Protozoans comprise a large, diverse assortment of m…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like