Sophie is studying how the protein transferrin enters cells. She finds clathrin-coated vesicles in cells exposed to transferrin, yet control cells, not exposed to transferrin, do not contain clathrin-coated vesicles. What mechanism was used to take transferrin into the cell

The serious method of transferrin transport by clathrin-containing vesicles

Explanation:

This is deduced from the fact that those cells that were exposed to transferrin expressed the vesiucular transport mechanism with clathrin.

Vesicular transport methods can be either to release substances into the internal or external cellular environment