GMS 6440 Final Exam Questions and Answers
(100% Correct Answers) Already Graded A+
For the mechanism of secondary active (ion-coupled)
transport of glucose, which of the following is responsible
for driving the transport events:
1. ATP direct coupling to the secondary active transporter
protein molecule
2. The power of the gradient of glucose, which is a greater
concentration outside the cell than inside the cell.
3. The power of the gradient of glucose, which is a greater
concentration inside the cell than outside the cell
4. The power of Na+, which is a greater concentration
outside the cell than inside the cell.
5. The power of Na+, which is a greater concentration
inside the cell than outside the cell. [Ans:] 4
In ion-coupled secondary active transport, a solute is
moved against its concentration gradient by being
'carried' along with an ion moving WITH its concentration
gradient.
So, glucose is the solute, and it gets 'carried' into the cell
along with Na+ as it moves down its concentration
gradient into the cell.
, Ion channels move their substrate ions across membranes
by which of the following means:
1. ion movement from a region of low concentration to a
region of high concentration
2. ion movement from a region of high concentration to a
region of low concentration
3. always binding ATP in order to energize the channel
4. always binding a ligand in order to unlock a voltage-
gated mechanism
5. always activating a ligand-locked gate by voltage-
dependent mechanism [Ans:] 2
the precursos 'ALWAYs' eliminates answers 3-5
The plasma membrane resting potential for many cell
types is roughly -90mV. This is primarily attributable to
which ion species and its electrochemical equilibrium
potential:
1. Cl- with an electrochemical equilibrium potential of -
90mV
2. Na+ with an electrochemical equilibrium potential of
+90mV
3. Na+ with an electrochemical equilibrium potential of -
90mV
(100% Correct Answers) Already Graded A+
For the mechanism of secondary active (ion-coupled)
transport of glucose, which of the following is responsible
for driving the transport events:
1. ATP direct coupling to the secondary active transporter
protein molecule
2. The power of the gradient of glucose, which is a greater
concentration outside the cell than inside the cell.
3. The power of the gradient of glucose, which is a greater
concentration inside the cell than outside the cell
4. The power of Na+, which is a greater concentration
outside the cell than inside the cell.
5. The power of Na+, which is a greater concentration
inside the cell than outside the cell. [Ans:] 4
In ion-coupled secondary active transport, a solute is
moved against its concentration gradient by being
'carried' along with an ion moving WITH its concentration
gradient.
So, glucose is the solute, and it gets 'carried' into the cell
along with Na+ as it moves down its concentration
gradient into the cell.
, Ion channels move their substrate ions across membranes
by which of the following means:
1. ion movement from a region of low concentration to a
region of high concentration
2. ion movement from a region of high concentration to a
region of low concentration
3. always binding ATP in order to energize the channel
4. always binding a ligand in order to unlock a voltage-
gated mechanism
5. always activating a ligand-locked gate by voltage-
dependent mechanism [Ans:] 2
the precursos 'ALWAYs' eliminates answers 3-5
The plasma membrane resting potential for many cell
types is roughly -90mV. This is primarily attributable to
which ion species and its electrochemical equilibrium
potential:
1. Cl- with an electrochemical equilibrium potential of -
90mV
2. Na+ with an electrochemical equilibrium potential of
+90mV
3. Na+ with an electrochemical equilibrium potential of -
90mV
