cell biology - membrane potential

Question 1

which of the following statements is true about the sodium-potassium ATPase pump?
a) make membrane potential more negative
b) moves 3 K+ into the cell
c) causes ions to move down their gradient
d) move 3 Na+ into the cell

Answer 1

a) make membrane potential more negative

Question 2

true or false: generally proteins are negatively charged

Answer 2

true

Question 3

true or false: ions can have a charge

Answer 3

true

Question 4

what is resting membrane potential?

Answer 4

-70 mV

Question 5

there are the most leak channels on a neuron for this ion.
a) sodium
b) chloride
c) potassium

Answer 5

c) potassium

Question 6

which of the following make membrane potential less negative?
a) sodium-potassium ATPase pump
b) proteins
c) sodium moving through leak channels
d) potassium moving through leak channels

Answer 6

c) sodium moving through leak channels

Question 7

which of the following make membrane potential more negative? (select all that apply)
a) sodium moving through leak channels
b) potassium moving through leak channels
c) sodium-potassium ATPase pump
d) proteins

Answer 7

b) potassium moving through leak channels
c) sodium-potassium ATPase pump
d) proteins

Question 8

there are the most leak channels on a neuron for this ion.
a) sodium
b) chloride
c) potassium

Answer 8

c) potassium

Question 9

membrane potential =
a) charge of the inside - charge of the outside
b) charge of the inside + charge of the outside
c) charge of the outside - charge of the inside

Answer 9

a) charge of the outside - charge of the inside

Question 10

what is needed for the sodium - potassium pump to function
a) proteins inside the cell
b) ATP
c) ion gradient
d) negative membrane potential

Answer 10

b) ATP

Question 11

__________ is a measure of how easy it is for molecules to cross a membrane
a) membrane potential
b) gradient
c) permeability

Answer 11

c) permeability

Question 12

if there are 2 ions inside of the cell and 4 ions outside of the cell, what is the overall membrane potential of the cell?

Answer 12

-2

Question 13

true or false: if you increased the number of potassium leak channels on a neuron, that would increase potassium’s permeability

Answer 13

true

Question 14

which of the following maintain resting membrane potential?
a) potassium moving through leak channels
b) sodium moving through leak channels
c) proteins inside the cell
d) sodium-potassium ATPase pump

Answer 14

d) sodium-potassium ATPase pump

Question 15

proteins are usually found
a) inside the cell
b) outside of the cell

Answer 15

a) inside the cell