ex1sp10 - Print and bubble names last-space Irst lOose the...

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Print and bubble names: last-space- Irst. lOose the best answer. Show ID as you hand it in. 1. The _ ..... _____ is always impermeable to water. A .-k" proximal convol uted tubule collecting duct as ce nding limb of loop of Henle D. A and B E. Band C 2. Which of the following is true? . Desert animals primarily excrete ammonia . B. Urea is more soluble in water than ammonia, but also more toxic . .-C/ Uricotelic animals are not well adapted to dry environments. [J; The primary forms of nitrogen excretion are ammonia , urea, and nitric acid. ---:.: .... -.".. -- ~ None of these 0\ ~ . C; c : 3. Two concentrations are separated by I cm in solution. The flux between the two concentr i tions is 500 .2.. _ L molecules/cm2/s. The concentration at one end is 10,000 molecules/ cm 3 and at the other end is 5 , 000 ~. ll) molecules/ cm 3. What must the diffusion constant, 0, be (in cm 2 /s)? J ~ n <. \ - l. A . .5 B .. 01 .. 1 D .. 05 E. 4. On average, human kidneys reabsorb about 99% of the water that is filtered out of the blood. @ True B. False 5. A muscle cell is dropped into distilled water. It contains the following millimolar concentrations of ions: Na+= 1Q , K+ = 140, Cn2+ _~ Q / 001. Cl- = 4, A - = 140 (includes all other anionic components). What is the approximate osmotic pressure developed inside the cell? (You may use the (rounded) gas constant R= 0.1, and temperature = 300° Kelvin for this calculation.) 11 -::c TG \ ~ l .\') V" J \ 1 ') A. 1.8 atm. B. 0.9 atm. C.0.18atm. D. 18 atm . :. 9 atm . Large mammals tend to be able to concentrate their urine ~ than small mammals, and arid mammals tend to be able to concentrate their urine 1'I\6 :t. than aquatic mammals . A. more. less B. less, less C. more, more D iess. more . 7. The mammalian kidney became more advanced than the amphibian kidney by acquiring the capability of_ . A. salt reabsorption by active transport, B. filtration of the blood forming a pre-urine filtrate © formin o a large co ncentration gradient permitting water reabsorption by osmo sis D. forming a capillary bed (glomerulus) ill the kidney E. A and B 8. What factors affect the distribution of ions across a semipermeable membrane at equilibrium? vA .
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