BIO 117 Final Exam Questions and
Valid Correct Answers
Cell body - correct answer ✔✔The nucleus and most of the organelles in a neuron are located in
the _____.
Synapse - correct answer ✔✔The point of connection between two communicating neurons is
called the _____.
hyperpolarization of the neuron - correct answer ✔✔For a neuron at rest with a membrane
potential of -65 mV, an increase in the movement of potassium ions out of that neuron's
cytoplasm would result in the ________.
sodium ions out of the cell and potassium ions into the cell - correct answer ✔✔The operation
of the sodium-potassium "pump" moves ________.
are triggered by a depolarization that reaches the threshold potential - correct answer ✔✔A
common feature of action potentials is that they ________.
opening of Na+ channels in the membrane - correct answer ✔✔The depolarization phase of an
action potential requires _____.
Because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions
are attracted to the negatively charged interior - correct answer ✔✔Why do Na+ ions enter the
cell when voltage-gated Na+ channels are opened in neurons?
immediate loss of action potential with gradual loss of resting potential - correct answer
✔✔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?
EPSPs must be greater than the IPSPs in order for an action potential to occur. - correct answer
✔✔Which of the following is TRUE about summation.
Excitatory Post-synaptic Potentials (EPSPs)
Inhibitory Post-synaptic potentials (IPSPs)
Myelin insulates the axons, allowing nerve impulses to jump from one node of Ranvier to
another. - correct answer ✔✔Why does the presence of a myelin sheath increase the speed at
which a nerve impulse travels?
foreign molecules that can initiate an immune response - correct answer ✔✔Antigens are
_____.
It enables a rapid defense against an antigen that has been previously encountered. - correct
answer ✔✔What major advantage is conveyed by having a system of adaptive immunity?
innate immune response - correct answer ✔✔The immune response that is rapid but generic is
called ________.
Only neutrophils and macrophages - correct answer ✔✔Phagocytic cells of innate immunity of
vertebrates include ________.
neutrophils
macrophages
platelets
mast cells
Valid Correct Answers
Cell body - correct answer ✔✔The nucleus and most of the organelles in a neuron are located in
the _____.
Synapse - correct answer ✔✔The point of connection between two communicating neurons is
called the _____.
hyperpolarization of the neuron - correct answer ✔✔For a neuron at rest with a membrane
potential of -65 mV, an increase in the movement of potassium ions out of that neuron's
cytoplasm would result in the ________.
sodium ions out of the cell and potassium ions into the cell - correct answer ✔✔The operation
of the sodium-potassium "pump" moves ________.
are triggered by a depolarization that reaches the threshold potential - correct answer ✔✔A
common feature of action potentials is that they ________.
opening of Na+ channels in the membrane - correct answer ✔✔The depolarization phase of an
action potential requires _____.
Because the Na+ concentration is much higher outside the cell than it is inside, and the Na+ ions
are attracted to the negatively charged interior - correct answer ✔✔Why do Na+ ions enter the
cell when voltage-gated Na+ channels are opened in neurons?
immediate loss of action potential with gradual loss of resting potential - correct answer
✔✔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?
EPSPs must be greater than the IPSPs in order for an action potential to occur. - correct answer
✔✔Which of the following is TRUE about summation.
Excitatory Post-synaptic Potentials (EPSPs)
Inhibitory Post-synaptic potentials (IPSPs)
Myelin insulates the axons, allowing nerve impulses to jump from one node of Ranvier to
another. - correct answer ✔✔Why does the presence of a myelin sheath increase the speed at
which a nerve impulse travels?
foreign molecules that can initiate an immune response - correct answer ✔✔Antigens are
_____.
It enables a rapid defense against an antigen that has been previously encountered. - correct
answer ✔✔What major advantage is conveyed by having a system of adaptive immunity?
innate immune response - correct answer ✔✔The immune response that is rapid but generic is
called ________.
Only neutrophils and macrophages - correct answer ✔✔Phagocytic cells of innate immunity of
vertebrates include ________.
neutrophils
macrophages
platelets
mast cells
