During amoeboid movement, the transition from ectoplasm to endoplasm is largely regulated by the assembly and disassembly of:
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Correct answer: Actin, undergoing sol-gel polymerization
Amoeboid movement depends on the sol-gel transformation of the cytoplasm driven by actin dynamics. Actin polymerizes into a rigid gel network at the leading edge (ectoplasm) and depolymerizes into a fluid sol at the trailing end (endoplasm), enabling the characteristic flowing movement.
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