BIO 152 FINAL EXAM WITH CORRECT
ANSWERS 2025
For a neuron with an initial membrane potential at -70 mV, an
increase in the
movement of potassium ions out of that neuron's cytoplasm
would result in the _____. correct answers >>
hyperpolarization of the neuron
The operation of the sodium-potassium "pump" moves _____.
correct answers >> sodium ions out of the cell and potassium
ions into the cell
ATP hydrolysis directly powers the movement of _____. correct
answers >> Na+ out of cells
The "threshold" potential of a membrane is the _____. correct
answers >> minimum depolarization needed to operate the
voltage-gated sodium and
voltage-gated potassium channels
The membrane's permeability to sodium ions is at its maximum at
_____. correct answers >> -50mV
The cell is not hyperpolarized; however, repolarization is in
progress, as the sodium
,channels are closing or closed, and many potassium channels
have opened at _____. correct answers >> the maximum mV
of graph
If you experimentally increase the concentration of K+ inside a
cell while maintaining
other ion concentrations as they were, what would happen to the
cell's membrane
potential? correct answers >> The membrane potential
would become less negative.
If the activity of the sodium-potassium pump was completely
stopped, what would
happen to the neuron's membrane potential? correct answers
>> slow decrease of resting potential
Tetrodotoxin blocks voltage-gated sodium channels and ouabain
blocks sodiumpotassium
pumps. If you added both tetrodotoxin and ouabain to a solution
containing
neural tissue, what responses would you expect? correct
answers >> immediate loss of action potential with gradual loss
of resting potential
Chum salmon (Oncorhynchus keta) are born in freshwater
environments and then
migrate to the sea. Near the end of their lives, they return to the
freshwater stream where
they were born to spawn. In freshwater, water constantly diffuses
into the body and ions
,are lost from the body. In salt water, body water diffuses out of
the body and excess ions
are gained from the water. A salmon's gills have special cells to
pump salt in or out of the
body to maintain homeostasis. In response to the salmon's moves
between freshwater and
salt water, some cells in the gills are produced and others are
destroyed. These changes
made in the cells of the gills during the lifetime of an individual
salmon are an example
of which of the following?
A) evolution
B) trade-off
C) acclimatization
D) adaptation correct answers >> C) acclimatization
You observe two female fish of the same species breeding. One
female lays 100 eggs
and the other female lays 1000 eggs. Which one of the following
is LEAST likely given
the limits of fitness trade-offs?
A) The female laying 100 eggs breeds more often than the female
laying 1000 eggs.
B) The female laying 100 eggs lives longer than the female laying
1000 eggs.
C) The eggs from the female laying 1000 eggs have larger yolks
than the yolks of the
eggs from the female laying 100 eggs.
, D) The female laying 1000 eggs is larger than the female laying
100 eggs. correct answers >> C) The eggs from the female
laying 1000 eggs have larger yolks than the yolks of the
eggs from the female laying 100 eggs
If you were to view a sample of animal tissue under a light
microscope and notice an
extensive extracellular matrix surrounding a tissue, which tissue
type would you most
suspect?
A) connective
B) cardiac muscle
C) epithelial
D) nervous
E) striated muscle correct answers >> A) connective
Blood is best classified as connective tissue because _____.
correct answers >> its cells are separated from each other by
an extracellular matrix
The type of muscle tissue surrounding the intestines and blood
vessels is _____. correct answers >> smooth muscle
A behavioral physiologist is studying the homeostatic control of
blood pH. In a trial,
a lizard runs on a treadmill for a set amount of time and the blood
pH is measured. The
ANSWERS 2025
For a neuron with an initial membrane potential at -70 mV, an
increase in the
movement of potassium ions out of that neuron's cytoplasm
would result in the _____. correct answers >>
hyperpolarization of the neuron
The operation of the sodium-potassium "pump" moves _____.
correct answers >> sodium ions out of the cell and potassium
ions into the cell
ATP hydrolysis directly powers the movement of _____. correct
answers >> Na+ out of cells
The "threshold" potential of a membrane is the _____. correct
answers >> minimum depolarization needed to operate the
voltage-gated sodium and
voltage-gated potassium channels
The membrane's permeability to sodium ions is at its maximum at
_____. correct answers >> -50mV
The cell is not hyperpolarized; however, repolarization is in
progress, as the sodium
,channels are closing or closed, and many potassium channels
have opened at _____. correct answers >> the maximum mV
of graph
If you experimentally increase the concentration of K+ inside a
cell while maintaining
other ion concentrations as they were, what would happen to the
cell's membrane
potential? correct answers >> The membrane potential
would become less negative.
If the activity of the sodium-potassium pump was completely
stopped, what would
happen to the neuron's membrane potential? correct answers
>> slow decrease of resting potential
Tetrodotoxin blocks voltage-gated sodium channels and ouabain
blocks sodiumpotassium
pumps. If you added both tetrodotoxin and ouabain to a solution
containing
neural tissue, what responses would you expect? correct
answers >> immediate loss of action potential with gradual loss
of resting potential
Chum salmon (Oncorhynchus keta) are born in freshwater
environments and then
migrate to the sea. Near the end of their lives, they return to the
freshwater stream where
they were born to spawn. In freshwater, water constantly diffuses
into the body and ions
,are lost from the body. In salt water, body water diffuses out of
the body and excess ions
are gained from the water. A salmon's gills have special cells to
pump salt in or out of the
body to maintain homeostasis. In response to the salmon's moves
between freshwater and
salt water, some cells in the gills are produced and others are
destroyed. These changes
made in the cells of the gills during the lifetime of an individual
salmon are an example
of which of the following?
A) evolution
B) trade-off
C) acclimatization
D) adaptation correct answers >> C) acclimatization
You observe two female fish of the same species breeding. One
female lays 100 eggs
and the other female lays 1000 eggs. Which one of the following
is LEAST likely given
the limits of fitness trade-offs?
A) The female laying 100 eggs breeds more often than the female
laying 1000 eggs.
B) The female laying 100 eggs lives longer than the female laying
1000 eggs.
C) The eggs from the female laying 1000 eggs have larger yolks
than the yolks of the
eggs from the female laying 100 eggs.
, D) The female laying 1000 eggs is larger than the female laying
100 eggs. correct answers >> C) The eggs from the female
laying 1000 eggs have larger yolks than the yolks of the
eggs from the female laying 100 eggs
If you were to view a sample of animal tissue under a light
microscope and notice an
extensive extracellular matrix surrounding a tissue, which tissue
type would you most
suspect?
A) connective
B) cardiac muscle
C) epithelial
D) nervous
E) striated muscle correct answers >> A) connective
Blood is best classified as connective tissue because _____.
correct answers >> its cells are separated from each other by
an extracellular matrix
The type of muscle tissue surrounding the intestines and blood
vessels is _____. correct answers >> smooth muscle
A behavioral physiologist is studying the homeostatic control of
blood pH. In a trial,
a lizard runs on a treadmill for a set amount of time and the blood
pH is measured. The
