209-practice exam 1 - BIOS 209 PRACTICE EXAM #1 (Sample...

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BIOS 209 PRACTICE EXAM #1 (Sample questions from past exams) 1) The resting membrane voltage of most cells is……… a) -150 mV b) -80 mV c) O, no voltage at rest d) +50 mV e) +100 mV 2) Where would you expect to find the highest Na+ concentration a) cytoplasm b) nucleus c) mitochondria d) extracellular fluid (blood) e) inside a muscle 3) Propagation of an action potential is possible due to the presence of…. . a) myelin b) sarcoplasmic reticulum c) Cl- channels d) ryanodine receptors e) voltage-gated ion channels 4) What is a "threshold voltage" a) a voltage greater than zero b) a voltage less than zero c) a depolarization to induce voltage-gated channels to open d) a hyperpolarization to induce voltage-gated channels to open e) the voltage where a channel closes 5) What is the direct role of the action potential when it reaches the synaptic knob. a) open ligand-gated channels b) close ligand-gated channels c) open voltage-gated calcium channels d) cause neurotransmitter synthesis e) activate the ryanodine receptor 6) Curare causes paralysis by what mechanism. a) inhibits myosin b) blocks voltage-gated channels c) inhibits neurotransmitter synthesis d) blocks DHP-receptors e) blocks nicotinic cholinergic receptors 7) If the length constant for a voltage change along an axon is increased, what is the result. a)
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209-practice exam 1 - BIOS 209 PRACTICE EXAM #1 (Sample...

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