(2)In vitro, (Polymerization) both ends of the mfgrow, but the plus end faster than the minus Because actin monomers tend to add to a filament 's plus end and leave from its minus end---r 0×080(2) In vitro, (Polymerization) both ends of the MF grow, but the plus end faster than the minus. Because actin monomers tend to add to a filament ’ s plus end and leave from its minus end----