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The plasma membrane forms the outer border of the cell, separating it from bordering cells and/or the external environment. it is composed primarily of a bi-lipid layer in addition to various proteins and cytoskeletal components. It performs multiple tasks, and contains many receptors and cell-to-cell channels whereby cells can communicate and interact with each other. There are several methods of describing cell movement, but in a single cell (classically in a white blood cell) chemotaxis is the method where the cells sense and respond to a specific stimulus by migrating toward it along a chemical gradient. This type of movement could be described as amoeboid if the cell forms pseudopods (legs), flagellate if they have a tail (flagellum) or migratory if the cell is present within a blood vessel where it attaches to specific receptors on the inside of the blood vessel, begins to roll, then attaches and leaves the vessel through small channels (again, typical of chemotaxis).
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Plasma membrane is best described as a fluid mosaic model?
Yes, the plasma membrane is best described as a fluid mosaic model because it consists of a fluid lipid bilayer with embedded proteins that can move laterally within the membrane. This fluidity allows for flexibility and dynamic interactions between the membrane components.
What does fluid mosaic mean in reference to the plasma membrane?
A plasma membrane is described as mosaic because all the different components such as proteins and phospholipids, of varying shape and size, give the effect of the stones of a mosaic. It is described as fluid because these components can move freely within the membrane.
What components of the plasma membrane is described by the fluid mosaic model?
embedded in a lipid bilayer
How does nutrients enter a cell?
The plasma membrane.
The current theory of the structure of the plasma membrane is best described by?
The current theory of the plasma membrane structure is the fluid mosaic model. This model describes the membrane as a fluid lipid bilayer with proteins and other molecules embedded within it, creating a dynamic and constantly changing structure that regulates the passage of substances in and out of the cell.
