AP BIOLOGY

Detailed explanation-1: -A cell may transport a substance in lysosomes / vesicles if the substance is too large to cross the membrane.

Detailed explanation-2: -Consequently, larger uncharged polar molecules such as glucose are unable to cross the plasma membrane by passive diffusion, as are charged molecules of any size (including small ions such as H+, Na+, K+, and Cl-).

Detailed explanation-3: -Exocytosis occurs when a cell produces substances for export, such as a protein, or when the cell is getting rid of a waste product or a toxin. Newly made membrane proteins and membrane lipids are moved on top the plasma membrane by exocytosis.

Detailed explanation-4: -Cells use exocytosis to secrete molecules too large to pass through the cell membrane by any other mechanism.

Detailed explanation-5: -For larger substances to get into or out of the cell, such as proteins or carbohydrates, they will rely on processes called endocytosis and exocytosis. Osmosis: osmosis is the movement of water molecules down its concentration gradient across a partially permeable membrane.