PNB 2250 EXAM 3 PRACTICE QUESTIONS AND ANSWERS

PNB 2250 EXAM 3 PRACTICE QUESTIONS AND ANSWERS The presence of poly-unsaturated fatty acids in the cell membrane is decreased in larger animals with lower mass-specific metabolic rates(E3) A. true B. false C. this is dependent on animal shape D. This is only true for swimming animals E. this is only true for flying animals - Ans:-A. true A size selective (but not solute selective) nephron filtration barrier ...(E3) A. is very uncommon in vertebrates ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 2/30 B. is not found in insects, which employ a solute specific filtration barrier C. is found only in mammals and requires very little energy to produce urine D. is commonly found in vertebrates and allows for excretion of solutes regardless of whether an animal has ever ingested them before E. is only found in reptiles because of the difficulty they face in excreting uric acid - Ans:-D. is commonly found in vertebrates and allows for excretion of solutes regardless of whether an animal has ever ingested them before Which of the following processes would not be lost if the myosin-actin molecular motor suddenly disappeared from an animals body? (E3) A. neuron stimulated shortening of striated muscle B. overall physical movement C. bone movement D. digestion E. meiosis - Ans:-E. meiosis The ability of myosin to act as a molecular motor is dependent on ...(E3) ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 3/30 A. the interaction of myosin with kinesin B. the consumption of ATP by dynein C. the interaction of the myosin head with tubulin D. the movement of the myosin head in contact with actin E. the movement of the myosin tail - Ans:-D. the movement of the myosin head in contact with actin A fish in seawater...(E3) A. rapidly gains water through the gills B. rapidly gains water through the gills C. actively pumps solutes out of its body through the gills D. must be an osmoconformer E. must produce a very dilute urine - Ans:-C. actively pumps solutes out of its body through the gills The absence of .... would allow striated muscle to contract in the absence of calcium (E3) ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 4/30 A. tropomyosin B. nebulin C. actin D. troponin C E. myosin ATPase activity - Ans:-D. troponin C Which of the following are not unique to the vertebrate kidney? (E3) A. Development of an interstitial osmolarity gradient B. Size selective filtration barrier in the glomerulus C. Ability to absorb or secrete solutes from or to the filtrate D. Presence of bilateral kidneys E. Requirement of sufficient blood pressure to drive ultrafiltration - Ans:-C. Ability to absorb or secrete solutes from or to the filtrate A ... fish cannot tolerate fluids with different osmolarities (E3) ©GRACEAMELIA 2024/2025 ACADEMIC YEAR. ALL RIGHTS RESERVED FIRST PUBLISH OCTOBER 2024 Page 5/30 A. stenohaline fish B. osmoconformer fish C. dihaline fish D. euryhaline fish E. polyhaline fish - Ans:-A. stenohaline fish A whale is capable of consuming large amounts of seawater because ... that allows them to ...(E3) A. of a very permeable filtration barrier...produce a much larger volume of urine B. of the presence of salt glands ... produce a more concentrated urine C. of a kidney with long nephrons and higher interstitial osmolarity gradient ... produce a more concentrated urine D. of a very high blood pressure ... produce much more filtrate and hence uri