Essay about Biological Membranes And The Membrane

1074 Words Feb 7th, 2015 5 Pages
Biological membranes are microscopic membranes that form the external boundary of the cytoplasm of a cell or enclose a vacuole; it regulates the passage of molecules in and out of the cytoplasm. The physical organization and functioning of all biological membranes depends on their constituents: lipids, proteins, and carbohydrates. The cell membrane is not restricted to the outer surface but it is also present inside surrounding some organelles. Biological membrane are dynamic structures that perform their vital physiological roles by allowing cells to interact with other cells and with molecules in the environment, it also acts like a barrier between the inside of the cell and the outside resulting in different chemical environments on the two sides (figure 1). The membrane; therefore serves a dual purpose of both protecting the interior of the cell from its external environment and provides a communication interface between the cell and its surroundings or other cells. The diverse functions performed by biological membranes can be attributed to the molecular composition and their structure.

Phospholipid is the fundamental component of the membrane. The membrane is a double layer known as bilayer, the phospholipid tails point inwards, facing each other and forming a non-polar hydrophobic interior while the phospholipid heads face the aqueous medium that surrounds the membrane (figure 2) some phospholipid tails are saturates and some are unsaturated. The more unsaturated…

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