Question

A student finds a species of autotrophic algae with a long filament that propels it through the water. The filament is a ____. A. flagellum. B. pseudopod. C. cilium. D. microtubule.

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The flagellum is a motility organelle that permits the cell to move about. All green algae include mitochondria with flat cristae. When two flagella are present, they are used to propel the cell forward. They are held together by a cross-shaped arrangement of microtubules and fibrous strands.

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