Cells come in various shapes and sizes. Based on the presence of a nucleus or membrane-bound organelles, cells are broadly classified as Prokaryotic cells or Eukaryotic cells. Let’s learn about each in more detail.
Prokaryotic cells lack both, a well-defined nucleus and membrane-bound cell organelles. Examples of prokaryotes are blue-green algae, bacteria and mycoplasma.
Among prokaryotes, bacteria are the most common and multiply very fast. They are single-celled and range in size from 0.2 to 10 microns (about 10 times smaller than most plant and animal cells). Bacteria are found everywhere – in rocks, soil, ocean water. Did you know that there are approximately 10 times more bacterial cells than human cells in the human body? Now, most of these bacteria are found in the digestive system where they help in digesting food.
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Introduction to Cell and Cell Theory
Based on the shape, there are four types of bacteria: