Bio 180 Exam 5 BYUI|87 Questions with 100% Correct Answers | Verified | Updated 2024

Lipid-soluble signal molecules, such as testosterone, cross the membranes of all cells but affect only target cells because: - ️️Intracellular receptors are present only in target cells. Which type of receptor is most associated with metabolism, cell growth, and cell division? - ️️Tyrosine kinase receptors Which type of receptor is a dimer that when bound to the proper ligand autophosphorylates? - ️️Tyrosine kinase receptors A drug designed to inhibit the response of cells to testosterone would almost certainly result in which of the following? - ️️A decrease in transcriptional activity of certain genes. Binding of a signaling molecule to which type of receptor leads directly to a change in distribution of ions on opposite sides of the membrane? - ️️Ligand-gated ion channel Which type of signaling is long-distance signaling mediated by chemicals released into the blood? - ️️Endocrine signaling The dissociation constant (Kd) for a receptor is the ligand concentration that results in ____ percent of the receptors being bound. - ️️50 The dissociation constants for epinephrine and norepinephrine on beta2-adrenergic receptors are 0.50 and 0.10 nM, respectively. Which of these ligands is more efficient in activating the beta2-receptors? - ️️Norepinephrine An inhibitor of which of the following could be used to block the release of calcium from the endoplasmic reticulum? - ️️Phospholipase C