[Biology] Membrane (cell membrane and cell wall)

MEMBRANE

  • A membrane is the outermost boundary of any cell.
  • It is the non-living part of the cell
  • Membrane gives the cell support and shape and serves as a boundary regulating the inflow and outflow of materials from the cell
  • Membrane is of two type
  1. Plasma membrane
  2. Cell wall

PLASMA MEMBRANE:

  • Plasma membrane, also called cell membrane, is the outermost boundary of an animal cell however in most plant cells, it is covered externally by a cell wall.

COMPOSITION OF PLASMA MEMBRANE:

Plasma membrane is mainly composed of lipids and proteins,
  • 60-80% are proteins
  • 20-40% are lipids
  • In addition, carbohydrates are present in minute quantities

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