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Cell Biology and Histology Fundamentals

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Key Points

  • The cell membrane, being exposed to the outside environment, is an important site of cell–cell communication.
  • Organelles are either separately enclosed within their own lipid bilayers (also called membrane-bound organelles) or are spatially distinct functional units without a surrounding lipid bilayer (non-membrane bounded organelles).
  • Mitochondria and chloroplasts are considered to have evolved from bacteria, known as the endosymbiotic theory.
  • The endoplasmic reticulum (ER), usually found near edge of the cell, is where proteins are synthesized, packaged and transported.
  • In the process of exocytosis, the undigested waste-containing food vacuole or the secretory vesicle budded from Golgi apparatus, is first moved by cytoskeleton from the interior of the cell to the surface.
  • If a cell's nucleus is more active in transcription, its membrane will have more pores.

Terms

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