Describe evaginations of cell membrane with an example.
Evaginations are out foldings of cell membranes.
Example : Microvilli. These are the evaginations present on epithelial cells like those of ileum. They help to increase the surface area for exchange of materials and absorption.
What are receptor molecules ?
Receptor molecules are specific proteins in the cell's plasma membrane that receive chemical signals from outside the cell. When such chemical signals bind to a receptor, they cause some form of cellular response.