BIPN 100 Extra Credit Quiz Review
updated correctly answered
"Glucose is transported from interstitial fluid into cells by glucose transporters to support
cellular metabolism." This type of explanation is
a. Mechanistic and tautological
b. Mechanistic and teleological
c. mechanistic
d. tautological
e. teleological - correct answer ✔✔b
Many molecules and variables are regulated to maintain levels within a homeostatic range.
According to Cannon, which of the following is not a homeostatically regulated variable?
a. sleep
b. According to Cannon, all of the above are normally maintained c. by homeostasis
c. Oxygen
d. Glucose
e. pH - correct answer ✔✔a
Which body fluid compartment(s) contains high a concentration of Na+ and little protein?
a. both plasma and intracellular fluid
b. interstitial fluid only
c. intracellular fluid only
d. both plasma and interstitial fluid
,e .plasma only - correct answer ✔✔b
The steroid hormone cortisol is lipophilic. What conditions increase cortisol entry into the cells?
a. Lower the temperature.
b. Increase the number of cortisol transporters in the membrane.
c. Decrease the surface area of the cell.
d. Decrease the concentration gradient between the intracellular and extracellular
compartments.
e. None are correct - correct answer ✔✔e
Which of the following would decrease membrane permeability to a molecule like sodium?
a. Remove sodium leak channels from the membrane.
b. None are correct
c. Increase the concentration gradient across the membrane.
d. Open voltage-gated sodium channels
e. Increase the surface area of the membrane. - correct answer ✔✔a
The sodium-potassium ATPase is mutated such that it now transports 1 potassium ion. Which
the following consequences would you expect for the affected cell?
a. Intracellular potassium concentration would increase and the cell's resting membrane
potential would be relatively depolarized.
b. Intracellular potassium concentration would decrease and the cell's resting membrane
potential would be relatively hyperpolarized.
c. Intracellular potassium concentration would decrease and the cell's resting membrane
potential would be relatively depolarized.
d. Intracellular potassium concentration would increase and the cell's resting membrane
potential would be relatively hyperpolarized. - correct answer ✔✔c
, For the sodium-glucose transporter (SGLT), glucose binds the receptor despite the low
concentration of glucose in the extracellular space. This is because the...
a. SGLT directly uses ATP to allow glucose to bind and be transported across the plasma
membrane.
None are correct
b. SGLT is a coincidence detector that allows glucose to bind when there is an appropriate ligand
and depolarization of the plasma membrane.
c. SGLT binds glucose when the concentration gradient of sodium is reversed by repetitive
action potential firing.
d. SGLT first binds sodium. Sodium binding causes a conformational change that reveals a high-
affinity glucose binding site to which glucose binds. - correct answer ✔✔d
You're performing an experiment on a red blood cell at 37° The extracellular fluid contains 4.5
mM K+, 145 mM Na+ and 116 mM Cl-. The intracellular fluid contains 150 mM K+, 15 mM Na+,
and 90 mM Cl-. What is the approximate equilibrium potential for K, Na, and Cl?
*EK is the equilibrium potential for potassium and so forth
a. EK = -93 mV, ENa = 60 mV, ECl = -6 mV
b. EK = 93 mV, ENa = 60 mV, ECl = 6 mV
c. EK = -93 mV, ENa = -60 mV, ECl = -6 mV
d. EK = 93 mV, ENa = -60 mV, ECl = 6 mV
e. EK = 93 mV, ENa = -60 mV, ECl = -6 mV - correct answer ✔✔a
For the same cell as described above, what would be the resting membrane potential if the
membrane's permeability are: K+ = 100, Na+ = 54, and Cl- = 21?
updated correctly answered
"Glucose is transported from interstitial fluid into cells by glucose transporters to support
cellular metabolism." This type of explanation is
a. Mechanistic and tautological
b. Mechanistic and teleological
c. mechanistic
d. tautological
e. teleological - correct answer ✔✔b
Many molecules and variables are regulated to maintain levels within a homeostatic range.
According to Cannon, which of the following is not a homeostatically regulated variable?
a. sleep
b. According to Cannon, all of the above are normally maintained c. by homeostasis
c. Oxygen
d. Glucose
e. pH - correct answer ✔✔a
Which body fluid compartment(s) contains high a concentration of Na+ and little protein?
a. both plasma and intracellular fluid
b. interstitial fluid only
c. intracellular fluid only
d. both plasma and interstitial fluid
,e .plasma only - correct answer ✔✔b
The steroid hormone cortisol is lipophilic. What conditions increase cortisol entry into the cells?
a. Lower the temperature.
b. Increase the number of cortisol transporters in the membrane.
c. Decrease the surface area of the cell.
d. Decrease the concentration gradient between the intracellular and extracellular
compartments.
e. None are correct - correct answer ✔✔e
Which of the following would decrease membrane permeability to a molecule like sodium?
a. Remove sodium leak channels from the membrane.
b. None are correct
c. Increase the concentration gradient across the membrane.
d. Open voltage-gated sodium channels
e. Increase the surface area of the membrane. - correct answer ✔✔a
The sodium-potassium ATPase is mutated such that it now transports 1 potassium ion. Which
the following consequences would you expect for the affected cell?
a. Intracellular potassium concentration would increase and the cell's resting membrane
potential would be relatively depolarized.
b. Intracellular potassium concentration would decrease and the cell's resting membrane
potential would be relatively hyperpolarized.
c. Intracellular potassium concentration would decrease and the cell's resting membrane
potential would be relatively depolarized.
d. Intracellular potassium concentration would increase and the cell's resting membrane
potential would be relatively hyperpolarized. - correct answer ✔✔c
, For the sodium-glucose transporter (SGLT), glucose binds the receptor despite the low
concentration of glucose in the extracellular space. This is because the...
a. SGLT directly uses ATP to allow glucose to bind and be transported across the plasma
membrane.
None are correct
b. SGLT is a coincidence detector that allows glucose to bind when there is an appropriate ligand
and depolarization of the plasma membrane.
c. SGLT binds glucose when the concentration gradient of sodium is reversed by repetitive
action potential firing.
d. SGLT first binds sodium. Sodium binding causes a conformational change that reveals a high-
affinity glucose binding site to which glucose binds. - correct answer ✔✔d
You're performing an experiment on a red blood cell at 37° The extracellular fluid contains 4.5
mM K+, 145 mM Na+ and 116 mM Cl-. The intracellular fluid contains 150 mM K+, 15 mM Na+,
and 90 mM Cl-. What is the approximate equilibrium potential for K, Na, and Cl?
*EK is the equilibrium potential for potassium and so forth
a. EK = -93 mV, ENa = 60 mV, ECl = -6 mV
b. EK = 93 mV, ENa = 60 mV, ECl = 6 mV
c. EK = -93 mV, ENa = -60 mV, ECl = -6 mV
d. EK = 93 mV, ENa = -60 mV, ECl = 6 mV
e. EK = 93 mV, ENa = -60 mV, ECl = -6 mV - correct answer ✔✔a
For the same cell as described above, what would be the resting membrane potential if the
membrane's permeability are: K+ = 100, Na+ = 54, and Cl- = 21?
