Practice question
Question
Deletion of extracellular ligand-binding domain of EGF receptor leads to constitutive activation of its PTK domain. Which growth curve best fits this behavior?
Explanation
Cell A grows independent of EGF; B depends on EGF, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question. Careful
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