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Quelle(s) est(sont) la(les) proposition(s) exacte(s) ? Concernant la communication cellulaire : A. Des concentrations très faibles d'hormones peuvent déclencher des réponses cellulaires très fortes par l'activation de cascades d'événements intracellulaires amplificateurs. B. La liaison d'un ligand spécifique résulte généralement en un changement conformationnel du récepteur, ce qui permet la transmission du signal à l'intérieur de la cellule. C. L'internalisation d'un récepteur membranaire entraine immédiatement son inactivation. D. Des mutations des gènes codant pour les récepteurs membranaires couplés aux protéines G peuvent conférer une activation constitutive de ces récepteurs.
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