Fall02Exam1 - UNIVERSITY OF NORTH TEXAS Department of...

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UNIVERSITY OF NORTH TEXAS Department of Biological Sciences, BIOL 3800 - E1, Animal Physiology, Prof. Gross, F 02 pg 1 Name: ___________________________________ BIOLOGY 3800 - ANIMAL PHYSIOLOGY - FALL 02, Exam 1 September 24, 2002 Section 1: True /False 1 point each 1. By definition, diffusion does not require a membrane. .......................................................... T F 2. Sodium chloride dissolved in water forms an electrolyte only at high temperatures (over 30 deg C). .................................................... ………………………………………… T F 3. Receptor endings called "free nerve endings" are formed by the peripheral process of unipolar cells. ...................................................................................................................... T F 4. Burning, non-adaptive pain sensations are transmitted faster than tacticle (touch) sensations T F 5. The active transport of water uses symports and antiports as a transport mechanism. ........... T F 6. The threshold for generating action potentials in glia cells is lower than the threshold in neurons……………………………………………………………………………………… T F 7. The water molecule is a polarized molecule with partial negative and positive charges. If placed between two electrodes it would slowly migrate (move) toward the cathode. ........ T F 8. Mammalian cells swell in a 0.25 osmolar solution. ................................ …………………. ... T F 9. Receptor endings called "peritrichial arborizations" are among the most sensitive of our tactile receptors………………………………………………………………………………T F 10. The Nernst equation allows the calculation of single ion diffusion potentials. ....................... T F 11 . Ionic bonds are generally weaker than hydrogen bonds. ...................................................... T F 12 . Cholesterol (a sterol) is a normal constituent of membranes. ............................... …………. . T F 13. Most synapses found so far in the mammalian CNS are chemical synapses . ........................ T F 14. Gap junctions are activated and opened by Ca++ ions………………………………………T F 15 . The rising phase of the action potential is generated by sodium ions moving through the sodium/potassium pump protein in the membrane. .......................................................... T F 16. A voltage change from -65 mV to -70 mV is a depolarization ............................................ T F 17. Large graded potentials are usually "self-propagating". ........................................................ T F 18 Indirect (slow) chemical synapses are always associated with a G-protein mechanism in the postsynaptic membrane…………………………………………………………………. . T F 19. The compound “ouabain” causes a slow loss of resting potentials………………………….T F 20. Astrocytes myelinate axons in the central nervous system. .................................................... T F 21. Transcription occurs after translation. .................................................................................. T F 22. The sodium pump may be classified as an "antiport"……………………………………. . T F 23. The conduction velocity of an action potential along an axon depends primarily on the length of the axon: the longer the axon, the faster the AP must travel. ................. …...T F 24. In Donnan equilibrium, diffusible solutes may be distributed unequally, but each compartment retains electoneutrality………………………………………………………. ..T F 25. Tight junctions may also function as electrical synapses in the nervous system. .................. T F Myelin contains a high density of voltage-gated sodium and potassium channels………….T
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This note was uploaded on 04/15/2008 for the course BIOL 3800 taught by Professor Gross during the Fall '03 term at North Texas.

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Fall02Exam1 - UNIVERSITY OF NORTH TEXAS Department of...

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