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Cell Structure and Function
CELL
ENDOPLASMIC RETICULUM• Consist of membrane enclosed tubules• 2 Types of ER:
1. Rough Endoplasmic Reticulum
2. Smooth Endoplasmic Reticulum
Smooth Endoplasmic Reticulum
Ribosomes
Function: - lipid synthesis- metabolize carbohydrates- detoxification of drugs and
poisons
Structure: lack of ribosomes and made up of tubular cavities
Rough Endoplasmic Reticulum
Ribosomes
Structure: a system of membranous tubes and sacs covered by ribosomes
Function: concerned with the transport of proteins which are made by the ribosomes on its surface
Proteins from the RER commonly travel
to the Golgi Apparatus
CELL
Golgi Apparatus• a series of stacked
membranes (cisternae)• Have a trans and cis face• As a processing, packaging,
and transport center of carbohydrates, proteins, and glycoproteins.
Functions of Golgi Apparatus• It receives protein from the ER
and chemically modifies them.(e.g. carbohydrates is added to proteins to form glycoproteins)
Functions of Golgi Apparatus• Proteins are concentrated,
packaged, and sorted before being sent to their cellular or extracellular destinations
• Forms lysosomes
Point of ER for easy comprehension:
1. There are 2 ER in cells – rough and smooth. The Ribosomes are attached at rough ER
2. The function of ribosomes are to synthesize proteins.The rough ER will carry the proteins.
3. The function of smooth ER is to do both synthesize and transporting lipids.
4. Finally. Both proteins and lipids will be send to Golgi Apparatus to be further processed / modified and packaged and send them out of the cell.
FIN