A. Cilia B. Centrioles C. Mitotic spindle D. Bacterial flagella E. Nuclear lamina 24. Briefly explain how it does so. ATP g S is a synthetic chemical very similar to ATP except that it cannot be hydrolyzed. Each free actin monomer carries a tightly bound ATP molecule, which is hydrolyzed to ADP soon after incorporation of the actin monomer into the filament. Hydrolysis of the bound ATP reduces the strength of the binding between the monomers and decreased the stability of the actin polymer, thus promoting depolymerization.
Cells contain many diverse types of myosins.
They all have a site at which ATP is bound and hydrolyzed, i.e . They all have a site at which they can bind to an actin filament 27. The actin filaments in skeletal muscle are associated with troponin C and tropomyosin. This displaces the attached tropomyosin from its position on the actin filament, uncovering a myosin-binding site. Myosin can then bind to the actin and produce a contraction.