Acetabularia


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Acetabularia

a genus of marine algae. Individuals may reach a size of 30 mm and are ACELLULAR with a body consisting of three distinct areas: head, stalk and a base containing the single NUCLEUS. Experiments by the German biologist Joachim Hammerling (b. 1901) using grafts between two species demonstrated that the nucleus alone is responsible for body morphology and produces a chemical substance which can control development. Such results cannow be interpreted as indications of the role of DNA and MESSENGER RNA.