BSCI 207 EXAM 4 QUESTIONS AND
VERIFIED ANSWERS (LATEST 2025- 2027)
100% CORRECT
A crab living in an estuary is essentially an osmoregulator. Match
the action on the left with the correct condition on the right:
Correct!gills take in water by osmosis during low tide (fresh
water)
Correct!urine is concentrated and of small amount during high
tide (salt water)
Correct!crab consumes water and salt from food during either
tide
Correct!skin loses water by osmosis during high tide (salt water)
- correct answer- Correct!gills take in water by osmosis
during low tide (fresh water)
Correct!urine is concentrated and of small amount during high
tide (salt water)
Correct!crab consumes water and salt from food during either
tide
Correct!skin loses water by osmosis during high tide (salt water)
A typical tendon has a strength of 100 MPa. Let's assume the
Achilles tendon is roughly rectangular in cross section with
,dimension of 6mm x 4 mm. You can use this to calculate the
force at which the Achilles tendon will start to fail.
At what force might the Achllles tendon start to fail (in newtons,
N)? - correct answer- 2400
At mammalian body temperature, the Goldman equation is
given by
𝐸𝑖𝑜𝑛=62𝑚𝑉log𝑃𝐾[𝐾+]𝑜𝑢𝑡+𝑃𝑁𝑎[𝑁𝑎+]𝑜𝑢𝑡+𝑃𝐶𝑙[𝐶𝑙−]𝑖𝑛𝑃𝐾[𝐾+]𝑖𝑛+
𝑃𝑁𝑎[𝑁𝑎+]𝑖𝑛+𝑃𝐶𝑙[𝐶𝑙−]𝑜𝑢𝑡Eion=62mVlogPK[K+]out+PNa[Na+]out
+PCl[Cl−]inPK[K+]in+PNa[Na+]in+PCl[Cl−]out
If there is no membrane permeability for sodium or chlorine,
what does this equation reduce to?
Correct! the Nernst equation for K
the Nernst equation for Na
the Nernst equation for Cl
it isn't possible to calculate this - correct answer- the
Nernst equation for K
Blood flow out to limbs are often set up so as to take advantage
of counter current exchange. For an endotherm in a cold
environment, this enables the limb to be cooler than the body.
Heat from the blood going out is transferred to the blood
,coming back into the body from the limb. - correct answer-
Answer 1:Correct!cooler
Answer 2:Correct!transferred to
Chemosensory neurons and neurons that respond to
neurotransmitters can have similar detection systems. Match up
the way in which the receptor and ion channel are coupled, with
the name of this type of function.
Correct!the receptor is the ion channel ionotropic
Correct!the receptor is indirectly coupled to the ion channel
through a G protein metabotropic
Other Incorrect Match Options:metropolitanionoscopic -
correct answer- Correct!the receptor is the ion channel
ionotropic
Correct!the receptor is indirectly coupled to the ion channel
through a G protein metabotropic
Consider a cylindrical leg bone. If its diameter increases by a
factor of 2 and its length stays the same, how does the buckling
force it can withstand change?
decreases by 4
decreases by 2
stays the same
, increases by 2
Correct! increases by 4 - correct answer- increases by 4
Daytime vision works when the output of all three cone types is
compared by the brain to determine the color of a particular
object. What is this most similar to?
Response of a stretch receptor to a muscle
Correct! the response of olfactory receptors to particular aspects
of a chemical molecule
the response of a pain receptor to heat
the response of a hair cell to sound - correct answer- the
response of olfactory receptors to particular aspects of a
chemical molecule
Electrical synapses are quite different from chemical synapses.
Select all that describe an electrical synapse.
Correct! Do not require neurotransmitter
Require neurotransmitter
Slower
Correct! Faster - correct answer- Do not require
neurotransmitter
VERIFIED ANSWERS (LATEST 2025- 2027)
100% CORRECT
A crab living in an estuary is essentially an osmoregulator. Match
the action on the left with the correct condition on the right:
Correct!gills take in water by osmosis during low tide (fresh
water)
Correct!urine is concentrated and of small amount during high
tide (salt water)
Correct!crab consumes water and salt from food during either
tide
Correct!skin loses water by osmosis during high tide (salt water)
- correct answer- Correct!gills take in water by osmosis
during low tide (fresh water)
Correct!urine is concentrated and of small amount during high
tide (salt water)
Correct!crab consumes water and salt from food during either
tide
Correct!skin loses water by osmosis during high tide (salt water)
A typical tendon has a strength of 100 MPa. Let's assume the
Achilles tendon is roughly rectangular in cross section with
,dimension of 6mm x 4 mm. You can use this to calculate the
force at which the Achilles tendon will start to fail.
At what force might the Achllles tendon start to fail (in newtons,
N)? - correct answer- 2400
At mammalian body temperature, the Goldman equation is
given by
𝐸𝑖𝑜𝑛=62𝑚𝑉log𝑃𝐾[𝐾+]𝑜𝑢𝑡+𝑃𝑁𝑎[𝑁𝑎+]𝑜𝑢𝑡+𝑃𝐶𝑙[𝐶𝑙−]𝑖𝑛𝑃𝐾[𝐾+]𝑖𝑛+
𝑃𝑁𝑎[𝑁𝑎+]𝑖𝑛+𝑃𝐶𝑙[𝐶𝑙−]𝑜𝑢𝑡Eion=62mVlogPK[K+]out+PNa[Na+]out
+PCl[Cl−]inPK[K+]in+PNa[Na+]in+PCl[Cl−]out
If there is no membrane permeability for sodium or chlorine,
what does this equation reduce to?
Correct! the Nernst equation for K
the Nernst equation for Na
the Nernst equation for Cl
it isn't possible to calculate this - correct answer- the
Nernst equation for K
Blood flow out to limbs are often set up so as to take advantage
of counter current exchange. For an endotherm in a cold
environment, this enables the limb to be cooler than the body.
Heat from the blood going out is transferred to the blood
,coming back into the body from the limb. - correct answer-
Answer 1:Correct!cooler
Answer 2:Correct!transferred to
Chemosensory neurons and neurons that respond to
neurotransmitters can have similar detection systems. Match up
the way in which the receptor and ion channel are coupled, with
the name of this type of function.
Correct!the receptor is the ion channel ionotropic
Correct!the receptor is indirectly coupled to the ion channel
through a G protein metabotropic
Other Incorrect Match Options:metropolitanionoscopic -
correct answer- Correct!the receptor is the ion channel
ionotropic
Correct!the receptor is indirectly coupled to the ion channel
through a G protein metabotropic
Consider a cylindrical leg bone. If its diameter increases by a
factor of 2 and its length stays the same, how does the buckling
force it can withstand change?
decreases by 4
decreases by 2
stays the same
, increases by 2
Correct! increases by 4 - correct answer- increases by 4
Daytime vision works when the output of all three cone types is
compared by the brain to determine the color of a particular
object. What is this most similar to?
Response of a stretch receptor to a muscle
Correct! the response of olfactory receptors to particular aspects
of a chemical molecule
the response of a pain receptor to heat
the response of a hair cell to sound - correct answer- the
response of olfactory receptors to particular aspects of a
chemical molecule
Electrical synapses are quite different from chemical synapses.
Select all that describe an electrical synapse.
Correct! Do not require neurotransmitter
Require neurotransmitter
Slower
Correct! Faster - correct answer- Do not require
neurotransmitter
