Relaying a message from a membrane receptor to a molecule that performs a specific function within a cell occurs when
A) a signaling molecule binds to a protein that extends to the outside of the cell.
B) a protein receptor on the interior of the membrane becomes bound by a signaling molecule.
C) the extracellular matrix is moved to the inside of the cell.
D) glycoproteins are recognized by other cells.
Answer: A
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