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Tiny indentations of the plasma membrane that resemble caves are called?
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Because it can pass some liquids, minerals and water through it.
The plasma membrane forms the external boundary of the cytoplasm of a cell. The fluid property of its lipid bilayer allows a tiny hole to heal.
because the plasma membrane has two layers
They are called integral proteins
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Let trans-membrane transport of molecules be either passive, or facilitated, or active: the plasma [bi-lipid layer] membrane has the power to exclude molecules It selects from… passage through the Membrane into the Cell's interior.
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The plasma membrane is the most thoroughly studied of all cell membranes, and it is largely through investigations of the plasma membrane that our current concepts of membrane… structure have evolved. Theplasma membranes of mammalian red blood cells (erythrocytes) have been particularly useful as a model for studies of membrane structure. Mammalian red blood cells do not contain nuclei or internal membranes, so they represent a source from which pure plasma membranes can be easily isolated for biochemical analysis. Indeed, studies of the red blood cell plasma membrane provided the first evidence that biological membranes consist of lipid bilayers. In 1925, two Dutch scientists (E. Gorter and R. Grendel) extracted the membrane lipidsfrom a known number of red blood cells, corresponding to a known surface area of plasma membrane. They then determined the surface area occupied by a monolayer of the extracted lipid spread out at an air-water interface. The surface area of the lipid monolayer turned out to be twice that occupied by the erythrocyteplasma membranes, leading to the conclusion that the membranes consisted of lipid bilayers rather than monolayers
Because it is only permeable to certain things, such as ions and steroid hormones.
the sarcolemma encloses the muscle cell
The plasma membrane is called a unit membrane because it is structurally and biochemically the same in all organelles, naturally including the pervasive endoplasmic reticulum.… Besides this, it is recognized by all organelles as Portions of The Unit Membrane.
Lipid molecules occur in the form of quasi-static fluid state. They are constantly in the random motion. Also, they have charges on their surface. Thus, they are in a state th…at is the characteristic of Plasma. They are called as membrane because they act as a barrier between the cellular environment and the extracellular material that surrounds the cells, selectively transferring the required molecules.
structural model of plasma membrane is called the selectively permeable membrane Structural model of the plasma membrane is called Fluid Mosaic Model.