Which of the following is true regarding signaling? d. G proteins activate their target proteins by phosphorylating them a. Non hydrolyzable GTP (a modified form of GTP that cannot be converted to GDP) would keep a G protein permanently activated e. Receptor kinases inactivate themselves by exchanging ATP for ADP O c. G proteins are activated by GDP phosphorylation O b. Hydrophobic signals bind to cell surface transmembrane receptors

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Learning and memory

Learning is defined as a relatively permanent and irreversible adaptive change in behavior. It always results from experience. The ability of an organism to store and recall the effects, sensations, and knowledge gained through learning and experience is called memory.