Structure and function of cells

"Structure determines function" is one of the basic principles of biology. If a cell has a certain structure, it should have corresponding physiological functions. ”。

If a cell is found to have a certain function, it can also reflect what kind of structure the cell should have and the characteristics of the structure.

For example, plasma cells can secrete a large number of antibodies, so it can be inferred that organelles related to protein secretion in plasma cells, such as ribosomes, endoplasmic reticulum and Golgi apparatus, are more developed than other normal cells, but it cannot be considered that cells have no related functions without a certain structure.

Prokaryotic cells are simple in structure, without developed biofilm system and various organelles, but they contain chemicals related to specific functions, so they still have related functions even without specific structures.

For example, Escherichia coli does not contain endoplasmic reticulum and Golgi apparatus, but it can still process protein, because its cytoplasmic matrix contains enzymes needed to process protein.