What is the cell?
The cell is the most basic unit of biological life. All known lives, with the exception of viruses, consist of cells. Cells are also the smallest metabolically functional unit of life, which means the smallest unit that can take nutrients from the bloodstream, convert them to energy, perform useful functions and secrete waste. In the kingdom of life there are two primary types of cells - prokaryotic cells, smaller bacterial cells without nucleus and eukaryotic cells, larger plant and animal cells with real core.
cells are relatively small. Prokaryotic cells are usually 1-10 UM (micrometers or millions of meters) across, while eukaryotic cells are 10-100 UM. Eggs are large cells and the largest known cell is now ostrich eggs, although prehistoric birds and some dinosaurs had eggs almost a length. Each cell is made from a different cell and each contains special genetic programming for the production of proteins that replaces things when the upsetting down, divide and perform functioncement life.
cell aggregation is known as a multicellular organism, with people being one of the examples. These cells are so small and numerous and cooperate so smoothly and evenly that it lasted until 1839 to find that all life is made of cells. This “cellular theory” is attributed to Matthias Jakob Schleiden and Theodor Schwann, the German botany who observed the cells under the microscope. Soon thereafter, English scientist Robert Hooke named Latin Celele, which means a small room.
Another difference between prokaryotic and eukaryotic cells is the presence of intracellular apartment or organel. Prokaryotic organelles are relatively minimal, with a plasma membrane (phospholipid bilayer), which performs most of the work performed by specialized organelles in eukaryotes such as a power plant as a power plant and macromolecule packagingIzed ribosomes. In addition to ribosomes, cytoplasm (cell fluid) and plasma membranes, prokaryotic cells may have other other organelles called mesosomes, but recent research suggests that these may only be artifacts created during the chemical fixation process for electron microscopy.
Some organelles in more complex eukaryotic cells see article "What are some organelles in the cell?"