Biol112-Exam4a-08-1 - version A (note this on your...

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1 version A (note this on your Scantron) your ID#:___ KEY-A _____ 90 total points possible Biol 112—General Biology II Exam 4 17 March 2008 There are 45 questions worth 2 points each. Choose the one best answer and circle the letter. You must use a ball point pen on this exam sheet; pencil is required for the Scantron form. Only Scantrons submitted with this exam document will be accepted and scored. 1. Which of the following is a correct statement about a resting neuron? a. The membrane is very leaky to sodium. b. The membrane is equally permeable to sodium and potassium. c. The membrane potential is more negative than the threshold potential. ! d. The concentration of sodium is greater inside the cell than outside. 2. The cortical reaction functions directly in the a. formation of a fertilization envelope/membrane. ! b. production of a fast block to polyspermy. c. release of hydrolytic enzymes from the sperm cell. d. generation of a nervelike impulse involving a change in the membrane potential by the egg membrane. 3. How does an EPSP (excitatory postsynaptic potential) facilitate depolarization of the postsynaptic membrane? a. by increasing the permeability of the membrane to Na + ! b. by increasing the permeability of the membrane to K + c. by insulating the hillock region of the axon d. by allowing Cl to enter the cell 4. The perceived pitch of a sound depends on a. vibrations of the tympanic membrane being transmitted through the incus. b. vibrations of the oval window creating wave formation in the fluid of the vestibular canal. c. the region of the basilar membrane where the signal originated. ! d. all the above 5. Where are neurotransmitter receptors located? a. on the nuclear membrane b. at nodes of Ranvier c. on the postsynaptic membrane ! d. on the membranes of synaptic vesicles 6. After sperm cells are produced, they are mainly stored in the a. urethra. b. prostate. c. epididymis. ! d. seminal vesicles.
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2 7. The divisions of the nervous system that have antagonistic (opposing) actions are a. motor and sensory. b. sympathetic and parasympathetic. ! c. presynaptic and postsynaptic. d. forebrain and hindbrain. 8. Which of the following hormones is (are) secreted by the adrenal gland in response to stress and promote(s) the synthesis of glucose from noncarbohydrate substrates? a. glucagon b. glucocorticoids ! c. epinephrine d. thyroxine 9. What is the correct sequence for transmission at a chemical synapse, using the following 5 steps (given here in random order)? 1. Neurotransmitter binds with receptors associated with the postsynaptic membrane. 2. Ca 2 + ions rush into the neuron's cytoplasm. 3. Action potential depolarizes the synaptic terminal membrane. 4. Ligand-gated ion channels open.
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This test prep was uploaded on 04/17/2008 for the course BIOL 112 taught by Professor Mcclowskey during the Winter '08 term at La Sierra.

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Biol112-Exam4a-08-1 - version A (note this on your...

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