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A steroid hormone typically binds its receptor

  • A.on the inner mitochondrial membrane
  • B.inside the cell, in cytoplasm or nucleus
  • C.on the outer face of the plasma membrane
  • D.within a lysosome after endocytosis

Answer: B

Being lipid-soluble it crosses the membrane unaided, and the receptor complex then acts directly on the DNA as a transcription factor. Water-soluble signals must instead be received at the surface. The route a signal takes follows directly from its solubility.

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