Many proteins on the outer surface of the cell are receptors,sites that "recognize" and bind with specific extracellular chemical messengers (signal molecules)in the cell's environment.

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This statement is true. Many proteins on the outer surface of the cell function as receptors that recognize and bind with specific extracellular chemical messengers. This process is crucial for cellular communication and response to external stimuli.

Many Proteins on the Outer Surface of the Cell Are