21. One of the major categories of receptors in the plasma membrane functions by forming dimers, adding phosphate groups, and then activating relay proteins. Which type does this?
(A) G protein-coupled receptors
(B) receptor tyrosine kinases
(C) steroid receptors
(D) ligand-gated ion channels
(E) glycolipid

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統計： A(7), B(19), C(0), D(0), E(1) #2735294