practice exam 2

practice exam 2 - Biology 240W Spring 2005 Midterm Quiz...

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Biology 240W Spring 2005 Midterm Quiz 2-- Version A March 2, 2005 Name: ______________________________ TA: ____________________ Page 1 of 6 Before you begin, PLEASE TURN OFF ALL CELL PHONES , write your NAME and TA on both the exam form AND the enclosed scantron. FILL IN THE EXAM VERSION ON YOUR SCANTRON . There are 41 multiple- choice questions each having only one BEST answer. You have 50 minutes to complete the exam. When you have finished, place the scantron inside the exam form and return both to your TA. 1) Erabutoxin is a deadly neurotoxin released from some species of sea snakes. This toxin inhibits acetylcholine receptor function on post-synaptic cells. How will this toxin affect the function of the nervous system? a. The toxin will over stimulate post-synaptic cells. b. Cells would remain depolarized following stimulation. c. The toxin will prevent excitatory post synaptic potentials (EPSPs) from acetylcholine receptors. d. The toxin will stimulate inhibitory post synaptic potentials (IPSPs) from acetylcholine receptors. (note: in some instances (e.g. parasympathetic motor neurons) AcCh can Æ IPSPs too) 2) Cutting neuronal processes (i.e. axons or dendrites) in the dorsal root of the spinal column would: a. prevent motor information from exiting the CNS. b. prevent sensory information from exiting the CNS. c. prevent motor information from entering the CNS. d. prevent sensory information from entering the CNS. 3) An antigen presented on MHC II will most likely be recognized by: a. B cells. b. macrophages. c. Helper T (T H ) cells. d. cytotoxic T (Tc) cells. 4) Light entering the eye must pass through several structures before eliciting a visual impulse. Which of the following accurately describes the path light takes? a. cornea Æ pupil Æ lens Æ vitreous humor Æ retina b. pupil Æ cornea Æ lens Æ aqueous humor Æ choroids c. sclera Æ pupil Æ vitreous humor Æ lens Æ retina d. cornea Æ iris Æ lens Æ retina Æ choroid 5) Multiple sclerosis is an autoimmune disease where an individual’s immune system attacks myelin within the central nervous system. How would this affect the function of the nervous system? a. without myelin, a neuron cannot fire an action potential. b. without myelin, saltatory conduction would be disrupted. c. without myelin, neurons would not have the structural and biochemical support they need. d. without myelin, the neuron would not have a refractory period following an action potential. 6) If a scary monster jumped out from under your bed, your __________________ would coordinate your body’s fight or flight response. a. mom b. sympathetic nervous system c. somatic nervous system d. parasympathetic nervous system
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Name: ______________________________ TA:____________________ Page 2 of 6 7) Dog whistles generate a very high pitched sound that dogs can hear but humans cannot. What could possibly explain this observation? a.
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practice exam 2 - Biology 240W Spring 2005 Midterm Quiz...

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