Homework Answers
the cholera toxin is a A-B type toxin. the A subunit (A1) will binds to the G protein and subunit of this toxin (A1) hydrolyze the NAD which gives ADP-ribose and nicotinamide. this ADP-ribose binds to the alpha subunit of the G protein and thus preventing dissociation of Galpha and beta-gamma separation.
so option C is correct.
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cholera toxin inhibits (prevents) what?
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What is the mechanism by which stimulation of adenylate cyclase by the alpha subunit of stimulatory...
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1. secreted by postganglionic sympathetic neurons at Islet alpha cells 2. extracellular binding site for (1.)...
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Ligand binding to a G-protein coupled receptor (GPCR) results in activation of a single G- protein...
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GTP-coupled receptors bind and interact with intracellular proteins. These proteins, in turn, each have a specific response in cell signaling. Place the description on the correct location of GPCR signaling. 1st attempt See Hint Plasma membrane GDP GDP GTP GDP leaves and exchanges with GTP, leading to subunit dissociation Ligand occupancy of receptor causes a twist in the transmembran e loops, opening the GTP/GDP pocket of the alpha subunit Inactive heterotrimeric G protein bound to GDP Beta/gamma subunits remain as...
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Acetylcholine binds to a GPCR on heart muscle, making the heart beat more slowly. The activated receptor stimulates a G protein, which opens a K channel in the plasma membrane, as shown in the figure below. Which of the following would enhance this effect of the acetylcholine? plasma membrane closed K' channel GTP Pr complex activated α subunit K CHANNEL open K'channel OPENING EXTRACELLULAR SPACE CYTOSOL GTP G-PROTEIN INACTIVATION K" CHANNEL CLOSING closed K' channel rt inactive G protein GOP...
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