AP BIOLOGY

Detailed explanation-1: -Which type of membrane protein would help intake a message from outside of the cell to inside of the cell? Ligands are signaling molecules that bind to receptors.

Detailed explanation-2: -Receptors are generally transmembrane proteins, which bind to signaling molecules outside the cell and subsequently transmit the signal through a sequence of molecular switches to internal signaling pathways.

Detailed explanation-3: -Signals Travel Into Cells In order to trigger a response, these signals must be transmitted across the cell membrane. Sometimes the signal itself can cross the membrane. Other times the signal works by interacting with receptor proteins that contact both the outside and inside of the cell.

Detailed explanation-4: -Cell-Surface Receptors These receptors are also known as transmembrane receptors. These are proteins that are found on the surface of cells and span the plasma membrane. They bind to ligands that cannot themselves pass through the plasma membrane.