TLS Online TPP Program
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TLS Online TPP Program
#Question id: 12180
#Unit 2. Cellular Organization
Following statements are regarding to cotransport.
A. The two forces constituting the electrochemical gradient—the membrane electric potential and the ion concentration gradient—may act in the same or opposite directions.
B. Cotransporters use the energy released by movement of an ion (usually H+ or Na+) down its electrochemical gradient to power the import or export of a small molecule or different ion against its concentration gradient.
C. Cotransporters use the energy released by movement of an ion (usually H+ or Na+) down its electrochemical gradient to power the import or export of a small molecule or different ion down its concentration gradient.
D. The cells lining the small intestine and kidney tubules contain symporters that couple the energetically favorable entry of Na+ to the import of glucose against its concentration gradient.
Which of the following is incorrect?
TLS Online TPP Program
#Question id: 12179
#Unit 2. Cellular Organization
Match the following human ABC proteins (Column I) with their function (Column II)
| Column I | Column II |
| A. ABCB1 | i. Transports Cl- ions |
| B. ABCB4 | ii. Exports phosphatidylcholine into bile |
| C. CFTR | iii. Exports cholesterol and phospholipid for uptake into high-density lipoprotein (HDL) |
| iv. Exports lipophilic drugs |
Which of the following is correct?
TLS Online TPP Program
#Question id: 12178
#Unit 2. Cellular Organization
Following statements are regarding to V-class ATPases.
A. An organelle lumen or an extracellular space to become acidic, movement of protons must be accompanied by movement of an equal number of anions (e.g., Cl−) in the same direction.
B. An organelle lumen or an extracellular space to become acidic, movement of protons must be accompanied by movement of equal numbers of a different cation in the same direction.
C. An organelle lumen or an extracellular space to become acidic, movement of protons must be accompanied by movement of equal numbers of a different cation in the opposite direction.
D. An organelle lumen or an extracellular space to become acidic, movement of protons must be accompanied by movement of an equal number of anions (e.g., Cl−) in the opposite direction.
Which of the following combination is correct?
TLS Online TPP Program
#Question id: 12177
#Unit 2. Cellular Organization
Calculate the free energy required to move 1 mol of K+ ions from the outside of the cell (where [K+] = 4 mM) to the inside (where [K+] = 140 mM) when the membrane potential is –70 mV and the temperature is 37°C.
TLS Online TPP Program
#Question id: 11523
#Unit 2. Cellular Organization
In the given figure, which of the following complex represents high energy intermediate?
TLS Online TPP Program
#Question id: 11522
#Unit 2. Cellular Organization
What is the major function of the actuator domain in Na+-K+ ATPase?