Berger, S. Schweiger, H. Shephard, D.
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Subscribe Search My Account Login. Abstract In four different species of Dasycladaceae Acetabularia the isozyme pattern of malic dehydrogenase was found to be species specific. Rent or Buy article Get time limited or full article access on ReadCube. Gas Exchange 5.
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Homeostasis Higher Level 7: Nucleic Acids 1. DNA Structure 2. Transcription 3. Translation 8: Metabolism 1. Metabolism 2. Cell Respiration 3.
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Cell biology of acetabularia.
Movement 3. Acetabularia is a genus of green algae in the family Polyphysaceae ,  Typically found in subtropical waters, Acetabularia is a single-celled organism, but gigantic in size and complex in form, making it an excellent model organism for studying cell biology. Unlike other giant unicellular organisms, which are multinucleate , Acetabularia has a single nucleus, located in the rhizoid and allows the cell to regenerate completely if its cap is removed.
The caps of two Acetabularia may also be exchanged, even from two different species. The name, Acetabularia , derives from the Latin word acetabulum , a broad, shallow cup used for dipping bread; the upturned cap of Acetabularia resembles such a cup.
For this reason, it is also sometimes called mermaid's wineglass. In the 19th century the same designation Acetabularia was proposed by George Edward Massee for a genus of fungi now Cyphellopus , but this usage is obsolete and considered invalid as the algal name takes precedence.
Acetabularia has three basic parts: its rhizoid, a short set of root-like appendages that contain the nucleus and anchor the cell to fissures in a substrate; its median stalk, which accounts for most of its length; and its apex, where its cap forms. There are usually several whorls of hair-like appendages close to the apex.
Acetabularia are among the largest single-celled organisms, having also a remarkably large nucleus. During sexual reproduction, the nucleus undergoes multiple rounds of mitosis , forming many daughter nuclei all within one nuclear membrane. These nuclei undergo meiosis and are transported to the tips of the branches, the sporangia, where they are released as gametes.
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Each Acetabularia cell is composed of three segments: the "foot" or base which contains the nucleus, the "stalk," and the "cap. After the exchange, each transplanted cap gradually changed from its original form to the form typical for the species of the base it was now attached to.
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