Define (1) Cell wall
(2) Cell membrane
(3) Unit membrane model
(4) Fluid mosaic model
(5) Selective permiable membrane
Answers
Answer:
cell wall : outer most layer in cell found in plant cell.
cell membrane:cell outer most layer in animal cell.
The unit membrane concept that says that all membranes have an underlying bilayer composed of phospholipids was originally proposed by Danielli and Davson in 1935. This concept extends to a wide variety of membranes from different organisms, each of which has a specific function.
The fluid mosaic model explains various observations regarding the structure of functional cell membranes. According to this biological model, there is a lipid bilayer in which protein molecules are embedded. The lipid bilayer gives fluidity and elasticity to the membrane.
Semipermeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by diffusion—or occasionally by more specialized processes of facilitated diffusion, passive transport or active transport.
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CELL WALL
a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. In the algae and higher plants it consists mainly of cellulose.
UNIT MEMBRANE MODEL
Robertson's unit membrane model' was given by J. David Robertson in 1959 after the Biomembrane model was proposed by Danielli and Davson in 1935. This Biomembrane model proposed by Robertson stated that Biomembranes are made up of four layers.
FLUID MOSAIC MODEL
in 1972 singer and Nicolson suggested a model, called fluid mosaic model, to explain the ultrastructure of the plasma membrane Or any other membrane of the cell.
SELECTIVE PERMEABLE MEMBRANE
Selective permeability is a property of cellular membranes that only allows certain molecules to enter or exit the cell. ... Movement across a selectively permeable membrane can occur actively or passively. For example, water molecules can move passively through small pores on the membranehope it helps you.