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PNB 2250 EXAM 3 Questions And Answers With 2024/2025 Updates
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PNB 2250 EXAM 3 Questions And Answers With 2024/2025 Updates 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 a...

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  • October 9, 2024
  • 18
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • pnb 2250 exam 3
  • pnb 2250 exam 3 questions and answers with 202420
  • pnb 2250 exam 3 questions and answers
  • the presence of poly unsaturated fatty acids in th

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PNB 2250 EXAM 3 Questions And Answers With
2024/2025 Updates
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
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)


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)


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)


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 urine
E. of a kidney with very short nephrons and an interstitial osmolarity gradient ... produce a large
volume of urine with low osmolarity ANS C. of a kidney with long nephrons and higher
interstitial osmolarity gradient ... produce a more concentrated urine


Which of the following statements about molecular motors is false ? (E3)


A. molecular motors drive the movement of large protein fibers
B, myosin is a member of gene superfamily and is expressed in all eukaryotic cells

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