PSU Bio 161 Exam 2
CQ/Preweek/Wrapup (Electrophysiology/
RMP & Graded Potentials) Questions
And Answers With Verified Solutions
Already Passed!!!
T/F?
sodium and potassium ions are both positively charged (cations) - ANSWER✔✔
true
T/F?
ions can cross a membrane without the help of an integral membrane protein -
ANSWER✔✔ false
because ions are charged, they are unable to cross the hydrophobic core of a
membrane. they require integral membrane proteins (either channels or pumps) to
move across a membrane.
T/F?
sodium potassium pumps require the use of energy to move ions - ANSWER✔✔
true
sodium potassium pumps are also classified as enzymes called ATPases because
these proteins hydrolyze ATP (-ase means "to cut") and use the transfer of energy
in active transport
T/F?
sodium potassium pumps move ions down their concentration gradient- from high
concentration to low concentration - ANSWER✔✔ false
sodium potassium pumps work to PUMP or actively move ions. this means that
they are being moved up their gradient fro where they are in low concentration to
high concentration.
T/F?
electrotonic spread requires the use of energy - ANSWER✔✔ false
electrotonic spread (also called a local potential) occurs when a transient high
concentration of sodium ions enter a neuron (usually through a gated channel
during a stimulus.) due to this high concentration, the sodium ions DIFFUSE (from
, high to low) and repel each other, leading to a dissipation (or spreading out) of ions
in the neuron
T/F?
the change of potential due to electrotonic spread will get larger the further away
from the starting point it travels. - ANSWER✔✔ false
as ions diffuse away from the original signal of an electrotonic (local) potential, the
potential gets smaller because there are fewer ions affecting the voltage
which of the following ratios represent the movement of ions from OUT of a
neuron to INSIDE a neuron due to sodium potassium pump?
-3 sodium ions out : 3 potassium ions in
-2 sodium ions out : 2 potassium ions in
-3 sodium ions out : 2 potassium ions in
-2 sodium ions out : 3 potassium ions in - ANSWER✔✔ 3 sodium ions out: 2
potassium ions in
which of the following characteristics contribute to sodium passively entering a
neuron if the membrane is permeable to sodium (like through a channel)? Choose
all that apply
-the inside of the cell is more negative than the outside
-the inside of the cell is more positive than the outside
-there are more sodium ions outside the cell compared to inside the cell
-there are fewer sodium ions outside the cell compared to inside the cell -
ANSWER✔✔ -the inside of the cell is more negative than the outside
-there are more sodium ions outside the cell compared to inside the cell
a drug binds to and inhibits protein pumps of a cell. what is one result of this
event?
- passive transport will not occur
- solutes will not move down their concentration gradient
- active transport will not occur
- facilitated diffusion will not occur - ANSWER✔✔ active transport will not occur
T/F?
creation of the chemical gradient requires the use of energy - ANSWER✔✔ true
Actions of the Na+/K+ pump causes the ICF to be slightly more _______
compared to the ECF - ANSWER✔✔ negative
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