What does it usually mean when an actin filament has an ATP cap?
Group of answer choices
The actin filament has additional ATP molecules added onto its actin-ATP units at the plus end to stabilize the filament and prevent dynamic instability.
The actin filament has additional ATP molecules added onto its actin-ATP units at the plus end to stabilize the filament and prevent treadmilling.
The actin filament has actin bound to ATP at the plus end.
The actin filament has actin covalently bound to ATP via a phosphodiester bond at the plus end.