Of the following, a receptor protein in a membrane that recognizes a chemical signal is most similar to

Of the following, a receptor protein in a membrane that recognizes a chemical signal is most similar to 




A) the active site of an allosteric enzyme that binds to a specific substrate.
B) tRNA specifying which amino acids are in a polypeptide.
C) a metabolic pathway operating within a specific organelle.
D) an enzyme having an optimum pH and temperature for activity.
E) an antibody in the immune system.



Answer: A


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