Which of the following statements is false?
a. G protein-linked receptors span the plasma membrane seven times, tyrosine kinase-linked receptors span the membrane once per polypeptide chain.
b. G protein-linked receptors form dimmers when activated, tyrosine kinase-linked receptors do not
c. G protein-linked receptors activate adenylate cyclase signaling pathways, tyrosine kinase-linked receptors do not
d. Both G protein-linked receptors and tyrosine kinase-linked receptors are expressed on the plasma membrane
e. Both G protein-linked receptors and tyrosine kinase-linked receptors contain signal sequences that target them to the endoplasmic reticulum