PNB 2250 EXAM 3 Questions Answered Correctly Latest 2025
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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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
C. all molecular motors are ATPases
D. meiosis within cells is dependent on kinesin molecular motors
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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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 - Answers 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
C. all molecular motors are ATPases
D. meiosis within cells is dependent on kinesin molecular motors
