(1) What proteins bind to foreign invaders and mark them for destruction

(2) What catalyze chemical reactions

Antibodies are proteins that bind to foreign invaders and mark them for destruction by phagocytic cells in a process known as opsonization.

Enzymes catalyze chemical reactions by lowering activation energy barriers and converting substrate molecules to products.

the concept of nucleosome occupancy, which reflects the fraction of cells from the population in which a given region of dna is occupied by a histone octamer

i dont know it at allnow im just getting points at this pint