Cell Signalling and Transduction Which of the following statements about G proteins is false? They must be active before the cell can make needed cAMP They are involved in signal cascades They bind to and are regulated by guanine nucleotides They become activated when bound to GDP They must be active before the cell can make needed cAMP They are involved in signal cascades They bind to and are regulated by guanine nucleotides They become activated when bound to GDP ANSWER DOWNLOAD EXAMIANS APP
Cell Signalling and Transduction A signal cascade induced by adrenaline or thyroxine results in the activation of a sequence of enzymes needed for the cell effect involves the activation of a G protein All of these must begin with receipt of the signal molecule by a surface receptor results in the activation of a sequence of enzymes needed for the cell effect involves the activation of a G protein All of these must begin with receipt of the signal molecule by a surface receptor ANSWER DOWNLOAD EXAMIANS APP
Cell Signalling and Transduction In terms of cell communication, what do bacterial pathogens such as cholera and anthrax have in common? They destroy the receptors for key signaling molecules They prevent the production of key signaling molecules They block the normal functioning of signal transduction mechanisms They alter the chemical structure of key signaling molecules They destroy the receptors for key signaling molecules They prevent the production of key signaling molecules They block the normal functioning of signal transduction mechanisms They alter the chemical structure of key signaling molecules ANSWER DOWNLOAD EXAMIANS APP
Cell Signalling and Transduction In vasodilation, proper nerve signals sent to blood vessels cause relaxation of smooth muscle cells the release of nitric oxide from endothelial cells reduced blood pressure All of these relaxation of smooth muscle cells the release of nitric oxide from endothelial cells reduced blood pressure All of these ANSWER DOWNLOAD EXAMIANS APP
Cell Signalling and Transduction Which of the following comes under the category of cell surface receptor? Enzyme linked receptors G protein linked receptors Ion-channel linked receptors All of these Enzyme linked receptors G protein linked receptors Ion-channel linked receptors All of these ANSWER DOWNLOAD EXAMIANS APP
Cell Signalling and Transduction Why is it that inhaling nitric oxide reduces blood pressure only in the lung tissue and not elsewhere in the body*? Because nitric oxide cannot cross cell membranes and enter the blood Because nitric oxide breaks down quickly and thus cannot travel far None of these Because other body tissues use a different signaling molecule Because nitric oxide cannot cross cell membranes and enter the blood Because nitric oxide breaks down quickly and thus cannot travel far None of these Because other body tissues use a different signaling molecule ANSWER DOWNLOAD EXAMIANS APP
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