What structures are formed when the plasma membrane engulfs a particle from outside the cell?

When the plasma membrane engulfs a particle from the outside of the cell, it forms endocytic vesicles. This process is known as endocytosis, during which the membrane invaginates (folds inward) to enclose the particle, subsequently pinching off to create a vesicle within the cytoplasm. Endocytic vesicles play a critical role in transporting substances into the cell, allowing it to intake nutrients, hormones, or even pathogens.

Other structures listed in the choices serve different functions within the cell. Lysosomes are organelles that contain enzymes for digestion of waste materials and cellular debris, but they are formed from the Golgi apparatus and not directly from the plasma membrane. Ribosomes are the sites of protein synthesis, whereas peroxisomes are organelles involved in lipid metabolism and detoxification, again not formed through the process of endocytosis. Hence, the formation of endocytic vesicles directly results from the engulfing activity of the plasma membrane.