List the structure(s) that form the boundary between the inside and the outside of each cell in Model 2.

Explanation:

An animal cell has a cellular membrane, which keeps its contents inside, differentiating the inside from the outside. A plant cell has both a cellular membrane and a cell wall, which keeps its shape and prevents it from going through lysis and cellular destruction

tl;dr

Animal cell: cell membrane

Plant cell: cell wall, cell membrane

i believe the answer would be b. hope it : )

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.