Biological Membranes And The Membrane Essay

957 Words Feb 6th, 2015 4 Pages
Biological membrane is a microscopic membrane composed mainly of lipids and proteins; which forms the external boundary of the cytoplasm of a cell or encloses a vacuole, and 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, cholesterols, and carbohydrates. 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. The cell membrane is not restricted to the outer surface but is also present inside surrounding the organelles. These biological membranes have played a crucial role in the evolution from prokaryotes to multicellular eukaryotes.
The membrane; therefore serves a dual purpose of both protecting the interior of the cell from its external environment and also 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 structure of these membranes. 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…

Related Documents