PNB 2250 Exam 3 Questions and
Answers 100% Pass
A fish in freshwater....(E3)
A. rapidly loses water through the gills
B. loses solutes through the gills
C. must be an osmoconformer
D. actively pumps solutes out of its body through the gills
E. must produce a very concentrated urine - ✔✔D
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
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,D. This is only true for swimming animals
E. this is only true for flying animals - ✔✔A
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 -
✔✔D
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
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, D. digestion
E. meiosis - ✔✔E
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 - ✔✔D
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 - ✔✔C
Katelyn Whitman, All Rights Reserved © 2025 3
Answers 100% Pass
A fish in freshwater....(E3)
A. rapidly loses water through the gills
B. loses solutes through the gills
C. must be an osmoconformer
D. actively pumps solutes out of its body through the gills
E. must produce a very concentrated urine - ✔✔D
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
Katelyn Whitman, All Rights Reserved © 2025 1
,D. This is only true for swimming animals
E. this is only true for flying animals - ✔✔A
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 -
✔✔D
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
Katelyn Whitman, All Rights Reserved © 2025 2
, D. digestion
E. meiosis - ✔✔E
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 - ✔✔D
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 - ✔✔C
Katelyn Whitman, All Rights Reserved © 2025 3
