Biol152 Quiz #2 Spring 2015 Key There is one best answer for each of the nine questions. 1) The lateral line system in fish is used to perceive _______ and is evolutionarily related to structures used for _______ in terrestrial (land dwelling) animals. a) water pressure : vision b) water pressure : hearing c) chemical detection : olfaction d) chemical detection : hearing e) water pressure : barometric pressure 2) If the hair cells at the apex of the basilar membrane are damaged it would: a) impair a person’s ability to hear high frequency sounds. b) impair a person’s ability to hear middle frequency sounds. c) impair a person’s ability to hear low frequency sounds. d) impair a person’s ability to hear all frequencies of sounds. 3) The process responsible for the evolution of complex structures is called: a) adaptive radiation b) selective reproduction c) differential development d) cumulative selection 4)The function of the iris in vertebrate eyes is to: a)focus on far or near objects. b)filter out harmful wavelengths of light c)maintain the spherical shape of the eye d)adjust the amount of light that enters the eye. 5) The bones in the middle ear act to: a) filter out low frequency sounds. b) transfer energy from the movement of the ear drum to the oval window. c) amplify the signal before it reaches the oval window. d) dampen sounds that are too loud. e) Both b and c are correct. 6) If a drug prevented the production of aceytlcholinesterase in the synapse connected to muscle tissue. That muscle would likely: a) be prevented from contracting. b) once contracted, remain contracted for longer than normal. c) have no change to its function.7) The evidence that photoreceptive cells evolved once and were passed up the evolutionary tree is that all organisms that can "see": a) have a cornea b) have ion channels c) develop from a single cell d) have a form of the Pax-6 gene. 8!How could you increase the magnitude of inhibitory postsynaptic potentials (IPSPs) generated at a synapse? a) increase sodium-potassium pump activity b) increase K+ permeability c) increase the influx of calcium d) All of the listed responses are correct. 9!Where are neurotransmitter receptors located? a) the nuclear membrane b) the nodes of Ranvier c) the postsynaptic membrane d) synaptic vesicle membranes e) the myelin sheath Extra Credit 10) What is the name of the animal that has a large volume of the sensory cortex devoted to an organ on its face? a) The star-nosed vole b) The star-nosed mole c) The star-nosed mouse d) The star-nosed