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| a mass of protoplasm found in most cells, directing their growth, metabolism, reproduction, and functioning in the transmission of genic characters |
| an organism or cell capable of synthesizing all its metabolites from inorganic material, requiring no organic nutrients |
yellow-green algae
members of the class Xanthophyceae (division Chromophyta), consisting of approximately 600 species, once classified with the green algae on the basis of similarity of body organization. The Xanthophyceae are distinguished by their food reserve (oil), the quantity of beta-carotene in their plastids, and motile cells with unequal flagella. Frequently their cell walls are two overlapping halves. The usual method of asexual reproduction is by motile zoospores or nonmotile resting aplanospores. Sexual reproduction is rare; the genus Vaucheria is an important exception.
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