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‘Prokaryotic cells.’
Member rating: No Rating | Words: | Submitted: Mon Jan 05 2004
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'Prokaryotic cells.' All living things are made of cells, and cells are the smallest units that can be alive. Life on Earth is classified into five kingdoms, and they each have their own characteristic kind of cell. However the biggest division is between the cells of the prokaryote kingdom (monera, the bacteria) and those of the other four kingdoms (animals, plants, fungi and protoctista), which are all eukaryotic cells. Prokaryotic cells are smaller and simpler than eukaryotic cells, and do not have a nucleus. Prokaryotic means 'pre-nucleus' and eukaryotic means 'true nucleus'. The nucleus in eukaryotic cells contains the DNA in linear chromosomes and is bounded by a nuclear membrane, but since a prokaryotic cell doesn't have a nucleus and its DNA is a single, circular coiled molecule that floats freely within the cell and is not bounded by nuclear membrane nor is it complexed with any proteins. In addition...
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