The plasma membrane of some white blood cells contain ________ that bind with proteins of cells such as bacteria that have invaded the human body.These special proteins tell the white blood cells those bacterial cells do not belong to that particular human and to phagocytize (eat)them.

Question

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The description mentions that the proteins on the white blood cells are "receptor proteins" that bind to proteins on invading bacterial cells to signal the white blood cells to phagocytize them. Choice A, channel proteins, do not necessarily bind to other cells, and Choices C and D, diffusion and carrier proteins, are not mentioned in the explanation at all.

The Plasma Membrane of Some White Blood Cells Contain ________