Practice question
Question
Absence of R7 photoreceptor cell in Drosophila eye indicates defect in
Explanation
Ras/MAPK signaling, 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.
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