By the ligand receptors on the surface of the cell membrane. How do transport proteins make it easier for certain molecules to diffuse across a membrane.
the binding of a signaling molecule, or ligand, to its receiving molecule, or receptor.
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Stem cells are divided into 2 main forms. They are embryonic stem cells and adult stem cells. Embryonic stem cells.
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they mutate and become immune to modern medicine
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23 pairs, 46 chromosomes in total.
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The item that produce food in the foor web eg grass is the producer for ows etc
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