它们体积细小，细胞质浓，细胞核大，无大液胞，细胞壁薄，具有较多粒线体和核糖体，能不断进行细胞分裂。
They are usually small, with dense protoplasm, large central nucleus and few vacuoles. Their cell walls are thin and without secondary deposits. They have large Numbers of mitochondria and ribosomes.
它们体积细小，细胞质浓，细胞核大，无大液胞，细胞壁薄，具有较多粒线体和核糖体，能不断进行细胞分裂。
They are usually small, with dense protoplasm, large central nucleus and few vacuoles. Their cell walls are thin and without secondary deposits. They have large Numbers of mitochondria and ribosomes.
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