The ability to detect light is based, in part, on a change from one form of retinal to another. Specifically, what is this change? a. a trans to cis conversion b. A hydrogenation reaction c. a cis to trans conversion d. A dehydrogenation reaction
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The ability to detect light is based, in part, on a change from one form of retinal to another. Specifically, what is this change? a. A dehydrogenation reaction b. A hydrogenation reaction c. A trans to cis conversion d. A cis to trans conversion
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What event is responsible for the conversion between cis and trans configurations of retinal? - the opening of Na+ channels - activation of a G protein - the absorption of light - activation of the enzyme phosphodiesterase - adaptation Which of the five types of taste sensations is the most sensitive? - bitter - salty - sweet - umami - sour Perception is: - Receiving signals by the receptors - Transducing signals to CNS - Changing cell membrane potential - Brain construction of the stimulus In sensory adaptation: - The receptor responsiveness to the stimuli decreases - The receptor responsiveness to the stimuli increases - The receptor responsiveness to the stimuli decreases and then immediately increases - The receptor responsiveness to the stimuli does not change Pain receptors: - Do not exist in humans - Do not exist in animals - Are called nociceptors - None of the above
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Which of the following events does not occur during light absorption in the vertebrate eye? a. The retinal component of rhodopsin changes from cis to trans form. b. Rhodopsin, a G-protein-coupled receptor, triggers a signal transduction pathway to close $\mathrm{Na}^{+}$ channels in the plasma membrane. c. The light stimulus passes from rods and cones to bipolar cells and horizontal cells and then to ganglion cells, whose axons compose the optic nerve. d. As light absorption increases, the rhodopsin response causes an increase in the release of neurotransmitters. e. When integrating information across the retina, horizontal cells connect the rods and cones, and amacrine cells join with the bipolar cells and ganglion cells.
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