Question: In terms of cell communication, what do bacterial pathogens such as cholera and anthrax have in common? [A]. They destroy the receptors for key signaling molecules [B]. They prevent the production of key signaling molecules [C]. They alter the…

Question: A signal cascade induced by adrenaline or thyroxine [A]. must begin with receipt of the signal molecule by a surface receptor [B]. involves the activation of a G protein [C]. results in the activation of a sequence of enzymes…

Question: Why is it that inhaling nitric oxide reduces blood pressure only in the lung tissue and not elsewhere in the body*? [A]. Because other body tissues use a different signaling molecule [B]. Because nitric oxide cannot cross cell membranes…

Question: If a disease of the blood vessels caused the endothelial cells of the vessel to die, what effect would that have on the cellular activities associated with vasodilation? [A]. Nitric oxide would no longer be produced [B]. Smooth muscle…

Question: A cell is known to respond to a particular signaling molecule. Which of the following must be true of this cell? [A]. It is in the heart muscle [B]. It is also the site of production for the signaling…

Question: Which of the following processes involve the combining of a message from one signaling molecule with that of another to either enhance or inhibit a cellular effect? [A]. Signal transduction [B]. Signal reception [C]. Signal integration [D]. Signal amplification…

Question: In the signal transduction mechanism known as protein phosphorylation [A]. the signaling molecule binds to a surface receptor [B]. receptor kinases play a key role in triggering the signal cascade [C]. phosphorylated proteins act with enzymes to trigger the…

Question: Which of the following statements about G proteins is false? [A]. They are involved in signal cascades [B]. They bind to and are regulated by guanine nucleotides [C]. They become activated when bound to GDP [D]. They must be…

Question: Nitroglycerin has long been administered to human patients suffering from chronic chest pain (angina). This medication works because it [A]. mimics the action of signal receptors [B]. is broken down into hormones that affect the heart [C]. interferes with…

Question: In vasodilation, proper nerve signals sent to blood vessels cause [A]. the release of nitric oxide from endothelial cells [B]. relaxation of smooth muscle cells [C]. reduced blood pressure [D]. All of the above Answer: Option D Explanation: No…