Cells use to take in large molecules or other cells. a. passive transport by osmosis b. active transport by endocytosis c. active transport by carrier proteins d. passive transport by diffusion

The correct answer is B. active transport by endocytosis.

Polysaccharides and protein molecules are quite large that cannot move into a cell by diffusion so they move by endocytosis through the active transport. The mechanism of active transport requires energy in the form of ATP molecules. The substances that move across the cell membrane against the concentration gradient use the energy of the cell and move through the membrane.

Endocytosis is also a form of active transport which moves large molecules like whole cells or parts of cells, proteins etc. into the cell. The plasma membrane forms a pocket around the target cell to be engulfed and then the pocket pinches off and the particle is contained in a new vacuole formed by the plasma membrane within the cell.