Phototransduction uses a signal transduction cascade similar to mechanisms stimu
ID: 859900 • Letter: P
Question
Phototransduction uses a signal transduction cascade similar to mechanisms stimulated by hormones and neurotransmitters. However, the visual sensory apparatus is stimulated by photons, and converts light energy into a nerve impulse. Determine whether each of the the following events increases phototransduction or does not increase phototransduction (either by not initiating a signal or by terminating the signal). The abbreviation cGMP is used for guanosine 3',5'-cyclic monophosphate (cyclic GMP), and PDE is used for phosphodiesterase.
Phototransduction uses a signal transduction cascade similar to mechanisms stimulated by hormones and neurotransmitters. However, the visual sensory apparatus is stimulated by photons, and converts light energy into a nerve impulse. Determine whether each of the the following events increases phototransduction or does not increase phototransduction (either by not initiating a signal or by terminating the signal). The abbreviation cGMP is used for guanosine 3',5'-cyclic monophosphate (cyclic GMP), and PDE is used for phosphodiesterase. Phototransduction increases Phototransduction does not increase rod cell membrane hyperpolarized high [Ca] inhibits guanylyl cyclase PDE bound to inhibitoryubunit (Ca?'] declines converst CTP to cGMP rod cell membrane hyperpolarized high (Ca?"] inhibits guanyyl oyclase transducin dissociates into To GTP and Tay GDP bound to transducin PDE bound to inhibitory subunit guanylyl cyclase converst GTP to cGMP Ca-"1 declines [cGMP] decreases 11-cis-retinal converted to all-trans-retinal Ta subunit encounters PDE Ta subunit hydrolyzes GTP CGMP PDE converts cGMP to biologically inactive 5-GMPExplanation / Answer
I think it's correct :)