Question

multiple choice question
in an adhesion junction, cells are connected by
extracellular filaments
membrane proteins
membrane channels

Explanation:

Adhesion junctions connect cells through membrane - associated proteins that interact with each other and with the cytoskeleton of adjacent cells. Extracellular filaments are not the main connection in adhesion junctions. Membrane channels are mainly for transport and not for cell - cell adhesion. Membrane proteins, specifically cadherins and integrins, are key in adhesion junctions for cell - to - cell connection.

Answer:

membrane proteins