biology notes

 CELL MEMBRANE OR PLASMA MEMBRANE OUTERMOST BOUNDARY; ✦ PLASMA MEMBRANE OR CELL MEMBRANE IS THE OUTERMOST  BOUNDARY   OF ALL CELL . COMPOSED OF; ✦ CELL MEMBRANE IS CHEMICALLY COMPOSED OF LIPIDS AND  PROTEINS; 60-80% ARE PROTEINS, WHILE 20-40% ARE LIPIDS . IN  ADDITION THERE IS  A SMALL QUANTITY OF CARBOHYDRATES. FUNCTION; ✦ CELL MEMBRANE FUNCTION AS A SEMI-PERMEABLE MEMBRANE ,   ALLOWING A VERY FEW  MOLECULES ACROSS IT WHILE FENCING   THE MAJORITY OF CHEMICALS INSIDE CELL.IN THIS WAY CELL   MAINTAINS THE INTERNAL COMPOSITION OF CELL. STRUCTURE; ✦ MANY BIOLOGIST CONTRIBUTED TO ESTABLISH THE STRUCTURAL ORGANIZATION OF CELL MEMBRANE.  UNIT MEMBRANE; ✦ IT WAS PROPOSED EARLIER THAT CELL MEMBRANE IS COMPOSED OF LIPID BILAYER SANDWICHED BETWEEN INNER AND OUTER LAYERS OF PROTEIN. THIS BASIC STRUCTURE IS CALLED THE UNIT MEMBRANE AND PRESENT IN ALL CELLULAR ORGANELLE. MODERN TECHNOLOGY OR CHEMICAL ANALYSIS; ✦ THE MODERN TECHNOLOGY H...