Page 2 - Lesson Notes
P. 2

  Membrane  biogenesis-  Itis  the  process  which  involves  the  synthesis  of  cell
                       membrane  with  the  help  of  proteins  and  lipids  synthesised  by  Smooth
                       Endoplasmic Reticulum.

               Rough Endoplasmic Reticulum:
                     Covered  with  ribosomes  giving  the  endoplasmic  reticulum  its  rough
                       appearance.
                     Responsible for protein synthesis and plays a role in membrane production.


















                       Figure: Structure of Endoplasmic

                                    Reticulum
                       Difference between RER and SER
                                    RER                                             SER

               Ribosome are present                            Ribosome are absent
               Specialised for synthesising protein            Specialised  for  synthesising  proteins  and
                                                               lipids


               The  products  pass  into  lumen  of  ER  for  The products do not pass into lumen of ER
               transportation to other places.                 for transportation to other places.




               It is mainly formed by flat sacs or cisternae  It is mainly formed of tubules and vesicles.




               (2) GOLGI APPARATUS
               Structure
                     First described by Camillo Golgi.
                     Consists of a system of membrane bound vesicles arranged parallel to each
                       other  in  stacks  called  cisternae  which  are  specialised  to  secrete  complex
                       biochemical.
   1   2   3