Final answer:
Adaptor proteins such as Sec23 and Sec24 are involved in vesicle budding and protein transport within cells. They help package cargo proteins into vesicles and recruit specific cargo proteins in receptor-mediated endocytosis.
Step-by-step explanation:
Adaptor proteins, such as Sec23 and Sec24, play a crucial role in the process of vesicle budding and protein transport within cells. These proteins help to package cargo proteins into separate vesicles with specific destinations. Adaptor proteins also recruit specific cargo proteins to bring into the cell during receptor-mediated endocytosis. They work in conjunction with other proteins, such as clathrin, to facilitate the movement of cargo proteins. For example, in receptor-mediated endocytosis, clathrin is linked to specific integral membrane proteins via adaptor protein 1 (AP1) to bring cargo proteins into the cell.