Final answer:
Profilin protein indeed facilitates the transfer of actin subunits from the monomeric pool to the filament ends, which is true. Profilin plays a key role in actin filament dynamics, crucial for cell motility and muscle contraction.
Step-by-step explanation:
The statement that profilin protein moves actin subunits from a pool to ends is true. Profilin is a monomer-binding protein that plays a crucial role in the dynamics of actin polymerization. When actin monomers (G-actin) are bound to ATP, they can be added to the plus end of actin filaments, promoting filament growth. Profilin assists by adding ATP-actin to the fast-growing (+) end of an actin filament and by catalyzing the exchange of ADP for ATP on G-actin, which is necessary for polymerization activity. This process is important for cell motility, muscle contraction, and various cellular structures such as microvilli and filopodia that are essential for the mechanical properties of cells.