Proteins are made in rough ER and lipids in smooth ER. They are modified in Golgi apparatus and transported to the cell membrane through vesicles, forming the membrane.
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Contact inhibition prevents tumor formation in humans. Plants can develop tumors, but they usually remain localized and do not spread like cancer in animals.
Cell theory states that all living organisms are made of cells, cells are the basic unit of life and new cells arise from existing cells. Matthias Schleiden first proposed that plants are made of cells.
No, cells do not grow forever. They grow, divide, perform functions and eventually die. New cells replace old ones, maintaining balance and proper functioning in the body.
Cancer cells grow uncontrollably due to loss of regulation. They form tumours and can spread to other parts of the body, damaging normal tissues and disrupting body functions.