What is similar about G protein-coupled receptors (GPCRs) and receptor tyrosine kinases (RTKs)?
A. Both are directly bound to G proteins.
B. Both bind to hydrophobic ligands.
C. Both are activated by autophosphorylation.
D. Both can activate phospholipase C.
E. Both are enzymes.
Answer: D
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a. analogous structure b. vestigial structure c. homologous structure d. convergent structure
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