Midterm 2 Key 2009

Midterm 2 Key 2009 - Name:_ Bio 125 Midterm 2 fall 09. Put...

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Name:_________________________ - 1 - Bio 125 Midterm 2 fall 09. Put your name on every page (11 pages total). Part 1 _________________________________ 24pts Part 2_________________________________ 44pts Part 3 __________________________________ 18pts Part 4 __________________________________ 6 pts. Part 5 ___________________________________ 8 pts Total __________________________________ 100pts
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Name:_________________________ - 2 - Part 1: True/ False. If the statement is true, circle true; if the statement is false, circle false. 12 questions 2 points each. 1. (F) All neurotransmitters are synthesized in the soma and carried to the axon terminal through axoplasmic transport. 2. (T) A neuron can have thousands of synaptic inputs. 3. (F) Termination of signaling may involve pumping neurotransmitter into the postynaptic terminal by transporters. 4. (T) Mechanoreceptors can inhibit neurons in the ascending pain pathway. 5. (F) Sensory (Topographic) maps are a unique feature of the somatic sensory system and are not found in the auditory or visual systems. 6. (T) The quality of a stimulus (what it represents and where it is) is determined by both the relevant receptors being activated and the neuron’s targets in the brain. 7. (F) Postsynaptic responses mediated by G-protein coupled receptors are faster than those mediated through ligand-gated channels. 8. (F) The end plate channels show a regenerative opening pattern that propagates an action potential along the length of the muscle fiber. 9. (T) An inhibitory postsynaptic potential can depolarize the cell. 10. (F) Amacrine cells reside in the outer plexiform layer and synapse onto rods and bipolar cells. 11. (T) OFF bipolar cells express NMDA receptors and depolarize in the presence of glutamte, while ON bipolar cells express mGluR6 and are hyperpolarized by glutamate. 12. (F) Ciliary muscles contract to reshape the lens, which is responsible for most of the focusing done by the eye.
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Name:_________________________ - 3 - Part 2: Multiple choice : circle the correct answer. 22 questions 2 points each. 1. At ionotropic synapses: (a) the receptor molecule is also the ion channel (b) transmission is faster than at metabotropic synapses (c) the postsynaptic membrane cab (can) be deperpolarized if the channel admits Cl- (d) All of the above (e) None of the above 2. At G-protein coupled receptors all of the following occur except: (a) transmitter binds to the receptor and the receptor changes shape (b) G-protein binds to the receptor (c) GTP jumps onto the G-protein beta subunit and bumps off GDP (d) G-protein splits into an alpha subunit and a beta + gamma subunit (e) G-protein subunits activate an effector(s) enzyme 3. G-protein coupled receptors can amplify signals because: (a) One 2nd messenger can activate many G-proteins (b) One G-protein can activate many neurotransmitters (c) One enzyme can synthesize many second messengers (d) All of the above (e) None of the above 4. Which one is NOT a 2nd messenger?
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Midterm 2 Key 2009 - Name:_ Bio 125 Midterm 2 fall 09. Put...

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