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Exam 2 Version 1 Answer Key

Exam 2 Version 1 Answer Key - Fundamentals of Neurobiology...

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Version 1 Fundamentals of Neurobiology, Exam 2, March 2008 Name: __________________________________________ 1. The photopigment in rods is called __________. It consists of a protein, ___________ , and a small molecule, _________ , that changes its conformation when it absorbs light. A) opsin ; transducin ; arrestin B) rhodopsin ; opsin ; retinal C) transducin ; rhodopsin ; retinal D) rhodopsin ; transducin ; retinal E) opsin ; rhodopsin ; phosphodiesterase 2. Hair cells depolarize in response to potassium _________ the hair cell. This results in _______ of ________ -gated calcium channels, and release of neurotransmitter. A) entering ; closing ; neurotransmitter B) exiting ; closing ; neurotransmitter C) exiting ; opening ; voltage D) exiting ; closing ; voltage E) entering ; opening ; voltage 3. Why does the fovea appear like a pit in the retina? A) Because of the presence of blood vessels that scatter light B) Because of the indentation formed when the optic nerve leaves the retina C) Because of an absence of photoreceptors D) Because of a high ratio of photoreceptors to ganglion cells E) Because of the lateral displacement of the cells layers above the photoreceptors 4. Which of the following is the function of direction-selective striate cortex neurons? 5. As a result of falling down a staircase the patient suffered a complete transection of the right optic tract. What is the consequence of this lesion?
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Version 1 6. Most of the eyes refractive power is accomplished by what structure? 7. Where are the first binocular neurons (neurons that receive input from both eyes) encountered in the visual system? A) The 'Where' pathway B) The 'What' pathway C) Primary visual cortex layer IV D) Primary visual cortex layer III E) Lateral geniculate nucleus (LGN)
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