Final answer:
Adherens junctions are formed by cell adhesion molecules that are associated with actin filaments, utilizing cadherins to connect cells. Desmosomes, while also using cadherins, are connected to intermediate filaments, not actin. Therefore, the correct option is A.
Step-by-step explanation:
The cell-cell junctions that are formed by cell adhesion molecules associated with actin filaments are known as adherens junctions. These junctions utilize cadherins or integrins to link cells to other cells or to the extracellular matrix. In the case of adherens junctions directly connecting cells, cadherins are the adhesion molecules that project through the cell membrane and connect across adjacent cells. These cadherins are directly tethered to actin filaments on the cytoplasmic side of the cell membrane, which can form a belt-like structure around the cell to maintain its shape and secure attachment to neighboring cells.
In contrast, desmosomes are also intercellular junctions that use cadherins for connection but are linked to intermediate filaments rather than actin. Desmosomes provide strong adhesion and are especially important in tissues that undergo repeated tension and stretching, such as skin, heart, and muscles.