Exam 1 (203_09) v0

Exam 1 (203_09) v0 - BIO 203 Exam 1 2/24/09 1) Choose the...

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BIO 203 Exam 1 2/24/09 page 1 1) Choose the most INCORRECT answer. Water and Ion Balance, a) An osmoregulator is also an ionoregulator. b) An ionoregulator may also be an osmoconformer. c) An osmoregulator may be hyperosmotic but not hypoosmotic d) An osmoconformer may be either euryhaline or stenohaline. 2) Choose the most INCORRECT answer. Water and Ion Balance – Water Budget a) Passive water gain through the gills is a significant challenge for fresh water fish. b) Bony fish in a marine environment (seawater) produce very concentrated urine to conserve water. c) Vertebrates that are able to drink seawater must have one or more mechanisms to actively export ions. d) Most vertebrates are osmoregulators with a BFOC of ~300mOsm. 3) Choose the most INCORRECT answer. Transport Epithelia a) Transport epithelia have asymmetrical distribution of transporters in their plasma membranes. b) In marine fish, transport epithelia in the gills export both Na + and Cl - using transcellular transport. c) Transport epithelia have abundant mitochondria to provide energy for active ion transport. d) During smoltification in salmon there is a marked increase in the number of chloride transport epithelial cells in the gills. 4) Choose the most INCORRECT answer. Thermoregulation and Water Balance a) In terrestrial endotherms, maintaining water balance is more difficult in a hot environment than in a cold environment. b) In a hot and dry environment, both camels and kangaroo rats use temporal counter- current exchange to minimize respiratory water loss. c) In a hot and dry environment, both camels and kangaroo rats use behavioral methods to minimize heat gain. d) When dehydrated, a camel produces urine that is strongly hyperosmotic with respect to BFOC. 5) Choose the most INCORRECT answer. Osmosis Assume two aqueous solutions (A and B) separated by a semipermeable membrane that is permeable only to water. a) If solution A is 0.2M NaCl + 0.1M sucrose and solution B is 0.3M sucrose, solution A is hyperosmotic with respect to solution B. b) If solution A is 0.3M NaCl + 0.1M KCl and solution B is 0.2M KCl and 0.2M sucrose, solutions A and B are isosmotic. c) If solution A is 0.2M NaCl + 0.1M sucrose and solution B is 0.4M sucrose, there will be net movement of water from compartment B to compartment A. d) If solution A is 0.25M NaCl and solution B is 0.5M sucrose, there will be no net movement of water between compartments A and B.
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BIO 203 Exam 1 2/24/09 page 2 6) Choose the most INCORRECT answer. Movement of Solutes Through Cell Membranes a) Increasing the concentration gradient of an ion across the membrane, increases the membrane permeability for that ion. b) Simple diffusion of a substance through a membrane requires a concentration gradient across the membrane for that substance, whereas active transport does not. c) Active transport requires energy and can move a substance through the membrane
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This note was uploaded on 07/28/2009 for the course BIO 203 taught by Professor Johncabot during the Fall '08 term at SUNY Stony Brook.

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Exam 1 (203_09) v0 - BIO 203 Exam 1 2/24/09 1) Choose the...

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