在内源性抗原降解中发挥重要作用的是（）。 A: proteasome B: endocytosis C: pinocytosis D: internalization E: exocytosis

There are different types of white blood cells that ingest bacteria and non-cellular debris. Through what process is this possible? A: exocytosis B: phagocytosis C: pinocytosis D: facilitated diffusion

When cells such as white blood cells of a vertebrate engulf bacteria, the membrane transport mechanism used is ( ). A: receptor-mediated endocytosis B: active transport C: passive transport D: Phagocytosis E: exocytosis

When a plasma membrane encloses small fluid droplets and takes them into the cell, a form of transport known as ( ) occurs. A: active diffusion B: receptor-mediated exocytosis C: Pinocytosis D: facilitated diffusion E: Phagocytosis