BI 331 Quiz QUESTIONS AND
VERIFIED CORRECT
ANSWERS [LATEST] GRADED
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SUCCESS
Which of the following would be most likely found in a cell that is subjected to significant
mechanical strain (such as a cell in the outer skin)?
The cell would have many smooth ER
The cell would have many golgi apparatuses
The cell would have many cytoskeletal elements
The cell would lack phospholipids in its cell membrane - CORRECT ANSWER-The cell would
have many cytoskeletal elements
What is meant by the term "chemically gated sodium channel"?
A membrane channel that opens when sodium binds to it, allowing neurotransmitter to enter a
cell
A membrane channel that opens when sodium binds to it, allowing potassium to leave the cell
A membrane channel that opens when some chemical binds to it, allowing sodium to cross the
cell membrane
A membrane pump that moves 3 sodium ions out of the cell using ATP - CORRECT ANSWER-A
membrane channel that opens when some chemical binds to it, allowing sodium to cross the
cell membrane
What directly causes a chemically gated channel to open?
,A neurotransmitter binding on the chemically gated channel
A mechanical force pushing on the channel
A change in the transmembrane potential due to some factor - CORRECT ANSWER-A
neurotransmitter binding on the chemically gated channel
Potassium ions have a ____ charge and ____ a cell when they flow down their concentration
gradient.
negative; enter
positive; enter
positive; exit
negative; exit - CORRECT ANSWER-positive; exit
Mature red blood cells lack nuclei and mitochondria. Which of the following is consistent with
this information?
They cannot change their membrane permeability to oxygen
They cannot add new transport proteins to their cell membranes
They cannot generate differential ion concentrations on either side of their membrane
They cannot make ATP - CORRECT ANSWER-They cannot add new transport proteins to their
cell membranes
, What is the role of the sodium-potassium pumps on the neuron cell membrane?
All of the options are valid
To move sodium against its concentration gradient
To move potassium against its concentration gradient
To establish the proper ionic concentrations of sodium and potassium across the cell
membrane - CORRECT ANSWER-All of the options are valid
True or False? At rest, the interior of a neuron has more potassium ions than the exterior, but is
relatively negative compared to the outside of the cell. - CORRECT ANSWER-True
Some cells, like neurons, are very long - some can be 6 feet long! Are leak channels and sodium-
potassium pumps present on all parts of the cell membrane? - CORRECT ANSWER-Yes
Which of the following will cause a graded hyperpolarization on a neuron?
A neurotransmitter opening a voltage gated potassium channel
A neurotransmitter opening a chemically gated sodium channel
A neurotransmitter opening a chemically gated potassium channel
A neurotransmitter opening a voltage gated sodium channel - CORRECT ANSWER-A
neurotransmitter opening a chemically gated potassium channel
VERIFIED CORRECT
ANSWERS [LATEST] GRADED
A+ 100% GUARANTEES
SUCCESS
Which of the following would be most likely found in a cell that is subjected to significant
mechanical strain (such as a cell in the outer skin)?
The cell would have many smooth ER
The cell would have many golgi apparatuses
The cell would have many cytoskeletal elements
The cell would lack phospholipids in its cell membrane - CORRECT ANSWER-The cell would
have many cytoskeletal elements
What is meant by the term "chemically gated sodium channel"?
A membrane channel that opens when sodium binds to it, allowing neurotransmitter to enter a
cell
A membrane channel that opens when sodium binds to it, allowing potassium to leave the cell
A membrane channel that opens when some chemical binds to it, allowing sodium to cross the
cell membrane
A membrane pump that moves 3 sodium ions out of the cell using ATP - CORRECT ANSWER-A
membrane channel that opens when some chemical binds to it, allowing sodium to cross the
cell membrane
What directly causes a chemically gated channel to open?
,A neurotransmitter binding on the chemically gated channel
A mechanical force pushing on the channel
A change in the transmembrane potential due to some factor - CORRECT ANSWER-A
neurotransmitter binding on the chemically gated channel
Potassium ions have a ____ charge and ____ a cell when they flow down their concentration
gradient.
negative; enter
positive; enter
positive; exit
negative; exit - CORRECT ANSWER-positive; exit
Mature red blood cells lack nuclei and mitochondria. Which of the following is consistent with
this information?
They cannot change their membrane permeability to oxygen
They cannot add new transport proteins to their cell membranes
They cannot generate differential ion concentrations on either side of their membrane
They cannot make ATP - CORRECT ANSWER-They cannot add new transport proteins to their
cell membranes
, What is the role of the sodium-potassium pumps on the neuron cell membrane?
All of the options are valid
To move sodium against its concentration gradient
To move potassium against its concentration gradient
To establish the proper ionic concentrations of sodium and potassium across the cell
membrane - CORRECT ANSWER-All of the options are valid
True or False? At rest, the interior of a neuron has more potassium ions than the exterior, but is
relatively negative compared to the outside of the cell. - CORRECT ANSWER-True
Some cells, like neurons, are very long - some can be 6 feet long! Are leak channels and sodium-
potassium pumps present on all parts of the cell membrane? - CORRECT ANSWER-Yes
Which of the following will cause a graded hyperpolarization on a neuron?
A neurotransmitter opening a voltage gated potassium channel
A neurotransmitter opening a chemically gated sodium channel
A neurotransmitter opening a chemically gated potassium channel
A neurotransmitter opening a voltage gated sodium channel - CORRECT ANSWER-A
neurotransmitter opening a chemically gated potassium channel
