PNB 2250 EXAM 3 QUESTIONS AND
ANSWERS 100% PASS
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 - ✔✔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
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,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. 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 - ✔✔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
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, 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. 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 - ✔✔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
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ANSWERS 100% PASS
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 - ✔✔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
Katelyn Whitman, All Rights Reserved © 2025 1
,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. 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 - ✔✔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
Katelyn Whitman, All Rights Reserved © 2025 2
, 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. 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 - ✔✔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
Katelyn Whitman, All Rights Reserved © 2025 3
