8. Describe
the characteristic and the function of plasma membrane
Answer:
Polar hydrophilic head is pointed toward the outside while hydrophobic tail is
pointed toward inside.
Hydrophilic head can only dissolved in water while
Hydrophobic tail can only dissolved in oil.
Plasma membrane is semi-permeable and regulate movement of substances in and
out of cell.
It separates the
contents of cells from their external environment.
A plasma membrane included pore protein, cholesterol,
glycoprotein, glycolipid, Channel protein
Cholesterol molecules help in stabilize the membrane
structure and reduce the entry or exit of polar molecules through the membrane.
Pore protein and Channel protein enable the passive
transport for molecules. Thus large molecules can pass through.
Also, it acts as receptor sites for recognizing certain
molecules, either from other organs or from the external environment.
It attach the cells to adjacent cells or the extracellular matrix due to the
presence of certain membrane proteins like integrins.
Assignment submitted by group 1 2011/2012 (IBM)
Polar hydrophilic head is pointed toward the outside while hydrophobic tail is pointed toward inside.
Plasma membrane is semi-permeable and regulate movement of substances in and out of cell.
It attach the cells to adjacent cells or the extracellular matrix due to the presence of certain membrane proteins like integrins.
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