Microcheck 312

The 80S eukaryotic ribosome is composed of 60S and 40S subunits. The cytoskeleton is a dynamic filamentous network that provides structure to the cell; it is composed of microtubules, actin filaments, and intermediate fibers. Flagella function in motility. Cilia either propel a cell or move material along a stationary cell.

■ Explain how actin filaments are related to phagocytosis.

■ Explain what is meant by the 9 + 2 structure of cilia and flagella.

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