StuDocu is not sponsored or endorsed by any college or universityExam 15 April 2016, questions and answersIntroductory Biology: Comparative Physiology (Cornell University)StuDocu is not sponsored or endorsed by any college or universityExam 15 April 2016, questions and answersIntroductory Biology: Comparative Physiology (Cornell University)Downloaded by yelena radutskaya ([email protected])lOMoARcPSD|3454541Name:_______________________________________ 1"Prelim'2'BioG'1440'SP16'–'April'15,'2016'''''Name:''____________________________________________________''Student'ID'#:''_______________________________________________''“By'signing'below,'I'acknowledge'that'I'am'abiding'by'Cornell'University’s'Code”.''Signature:'''_________________________________________________'''''''''''''''''''''''!!!All!multiple!choice!are!worth!3!pts!each!and!all!short!answers!are!worth!4!pts,!possible!67!points!total.!!''Q14'Q15'Q16'Q17'Q18'Q19'Q20'SA'MC'Total''''''''''''''!!' Total'pages'in'exam'including'cover:'7' WATCH'YOUR'TIME!''This'is'a'50'minute'test."'PLEASE:'1.'' WRITE'YOUR'NAME'on'all'pages'of'the'exam.'2.' Be'sure'to'fill'out'your'full'name'and'your'7'digit'Cornell'ID'on'the'scantron'sheet.'3.' Record'answers'to'all'multiple'choice'questions'on'the'bubble'sheet!in!pencil!or!pen'and'answers'to'short'answer'questions'directly'on'the'exam'in!pen.'Short'answer'questions'not'written'in'pen'will'not'be'eligible'for'rebgrading.'''4.'' Write'legibly.''If'we'cannot'read'your'answer,'we'WILL!NOT'grade'it.'5.'' Use'only'the'space'provided.'Answers'provided'outside'of'space'provided'will'not'be'graded.'6.'' Do'NOT'use'calculators'or'any'other'electronic'devices.'7.'' Write'down'the'day'and'time'your'discussion'section'meets'and!circle'the'name'of'your'TA:'''' Day!and!Time!of!your!section'________________''Adam'Bisogni'''''''Matt'Lewis'''''''David'Peck'''''''''Adrian'Powell'''''''''Fahad'Raza''''''''Glenn'Stamps'''''''''''Downloaded by yelena radutskaya ([email protected])lOMoARcPSD|3454541Name:_______________________________________ " "2"!!!Multiple!Choice:!'1.'Which'of'the'following'is'FALSE'about'neurons?'A.' Both'Rm'and'Ri'influence'how'fast'the'membrane'potential'changes'after'an'injection'of'current'B.' Most'neurons'transfer'information'to'other'neurons'via'chemical,'rather'than'electrical,'connections'C.' Neurons'convey'information'via'manipulating'the'electrical'properties'of'the'postsynaptic'cell'D.' Most'neurons'only'convey'information'in'one'direction'E.' Neurotransmitter'signaling'is'faster'than'hormone'signaling''2.'Which'variable'in'the'Goldman'Equation'(which'is'absent'from'the'Nernst'Equation)'allows'the'Goldman'Equation'to'predict'the'actual'observed'voltage'of'a'membrane?'A.' Membrane'capacitance'B.' The'membrane'permeability'of'each'ion'C.' Ionbindependent'membrane'resistance'D.' Axon'diameter'E.' Membrane'ion'channel'orientation''3.'You'are'recording'from'two'neurons.'The'physical'properties'of'both'neurons'are'identical'with'one'exception;;'Neuron'#1'has'twice'the'density'of'leaky'K+'channels'as'Neuron'#2.'You'inject'a'series'of'subthreshold'pulses'of'positive'current'of'the'same'amplitude'into'each'neuron.''Assume'both'neurons'exhibit'temporal'summation.'Based'on'the'properties'of'the'two'neurons,'select'the'statement'below'that'BEST'describes'what'you'would'observe.''A.' Each'current'pulse'will'trigger'a'smaller'change'in'membrane'potential'in'Neuron'#2'compared'to'Neuron'#1'B.' The'rate'the'membrane'potential'changes'is'the'same'for'both'neurons''C.' The'number'of'current'pulses'required'to'reach'threshold'will'be'greater'for'Neuron'#1''D.' The'threshold'for'triggering'an'action'potential'is'higher'in'Neuron'#2'E.' The'electrical'responses'recorded'in'both'neurons'would'be'identical'''4.'You'inject'EDTA,'a'compound'that'reduces'the'free'[Ca2+],'into'the'axon'terminal'of'a'neuron.''You'then'trigger'an'action'potential'in'the'neuron,'and'measure'the'current'in'a'postsynaptic'neuron.''Assuming'the'postsynaptic'response'is'excitatory,'which'of'the'following'is'most'likely'to'occur'after'the'injection'of'EDTA?'A.' You'will'observe'no'change'in'the'postbsynaptic'response'because'there'is'very'little'freebcalcium'in'the'cytoplasm'of'neurons'at'any'given'time'B.' EPSPs'will'not'be'observed'because'the'EDTA'will'block'the'voltage'gated'Ca2+'channels'in'the'prebsynaptic'neuron'C.' EDTA'will'reduce'Ca2+'mediated'release'of'neurotransmitters,'therefore'reducing'measured'EPSPs'D.' EDTA'will'reduce'Ca2+'mediated'recycling'of'neurotransmitter'catabolism'and'metabolism,'therefore'reducing'total'neurotransmitter'levels'and'measured'EPSPs'E.' Spatial'summation'will'cease'to'occur,'and'therefore'no'EPSPs'will'be'measured''5.'If'the'following'5'events'in'excitationbcontraction'coupling'at'the'neuromuscular'junction'were'put'into'the'proper'temporal'order,'which'event'would'occur'third?''' A.'' Depolarization'of'the'sarcoplasmic'reticulum'' B.'' Ca2+'binds'to'troponin'' C.''Release'of'acetylcholine'from'vesicles'' D.''Tropomyosin'configuration'changes'' E.'' Myosin'heads'bind'to'Fbactin'and'ratchets'Downloaded by yelena radutskaya ([email protected])lOMoARcPSD|3454541Name:_______________________________________ 3"''6.'If'the'toxin'of'a'venomous'snake'bound'to'the'Ca2+'pumps'of'the'sarcoplasmic'reticulum'such'that'they'remained'open,'what'would'happen'to'the'muscle'after'stimulation?'A.' The'muscle'could'contract'normally'B.' The'muscle'could'not'contract'at'all'C.' The'muscle'could'not'stop'contracting'D.''The'muscle'could'only'contract'a'little'bit'E.'' The'muscle'would'go'limp''7.'In'the'patellar'reflex'circuit,'what'role'does'the'interneuron'play?'A.' The'interneuron'inhibits'the'quadriceps'muscle'contralateral'to'the'side'of'the'stimulus'B.' The'interneuron'excites'the'intrafusal'fiber'on'the'ipsilateral'side'of'the'stimulus'C.' The'interneuron'inhibits'the'intrafusal'fiber'on'the'ipsilateral'side'of'the'stimulus'D.' The'interneuron'inhibits'the'motor'neuron'for'the'antagonistic'muscle'ipsilateral'to'the'side'of'the'' stimulus'E.'
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