| 21. | The hair bundle consists of an array of actin-based stereocilia.
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| 22. | ATP binds to the cross bridges between myosin heads and actin filaments.
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| 23. | The calcium activates the formation of myosin-actin cross-bridging.
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| 24. | Engulfment of material is facilitated by the actin-myosin contractile system.
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| 25. | Other cytoskeletal proteins and actin binding proteins are involved in the procedure.
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| 26. | Actin polymerization and depolymerization is necessary in chemotaxis and cytokinesis.
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| 27. | The growth of actin filaments can be regulated by thymosin and profilin.
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| 28. | Specific modifications, such as SUMOylation, allows for nuclear actin retention.
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| 29. | Actin polymerization then propels the bacterium unidirectionally into the host cell membrane.
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| 30. | The binding of a new ATP molecule will release myosin from actin.
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