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Yeast Cell. The individual, microscopic, nonmotile organism of the species Saccharomyces cerevisiae. It consists of a differentiated protoplasm, contained within a cell wall, which is made up of a single dense nucleus (q.v.) and of cytoplasm, a colloidal matrix that contains numerous granules and vacuoles of reserve nutrients that consist of glycogen (q.v.), lipids (q.v.), protein (q.v.), nucleic acid (q.v.), and others. The nucleus represents the most vital part of the cell as it directs its growth, metabolism, and reproduction, and determines its genetic character.