Editing Cell Biology (section)

== <span style="color: #FFFFFF;">Understanding</span> ==
The cell is a system of specialized compartments (organelles) working together.

'''The Factory Analogy''':
* '''The Blueprint''': DNA (in the Nucleus).
* '''The Construction Workers''': Ribosomes.
* '''The Assembly Line''': Endoplasmic Reticulum.
* '''The Shipping Department''': Golgi Apparatus.
* '''The Power Plant''': Mitochondria.
* '''The Security Fence''': Cell Membrane.

'''Prokaryotes vs. Eukaryotes''': Eukaryotic cells are much larger and more complex. They evolved about 2 billion years ago, likely through '''Endosymbiosis'''—the theory that mitochondria and chloroplasts were once free-living bacteria that were "swallowed" by a larger cell and formed a symbiotic relationship.

'''The Flow of Energy''': All cellular work requires ATP. Mitochondria burn glucose in the presence of oxygen to recharge "empty" ADP molecules into "full" ATP. This process is called '''Cellular Respiration'''. If oxygen is missing, the cell turns to '''Fermentation''', which is much less efficient.
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