Final answer:
MBL and CRP can both act as opsonins, molecules that mark pathogens for destruction by phagocytic cells.
Step-by-step explanation:
Both MBL and CRP can both act as opsonins. Opsonins are molecules that mark pathogens for destruction by phagocytic cells like macrophages or neutrophils. Phagocytic cells are highly attracted to macromolecules complexed with antibodies, which include MBL and CRP. These molecules enhance the process of phagocytosis by helping phagocytes attach to and engulf the pathogens they have bound to.