2. Cell Chemistry & Cell Components

Which molecule is primarily used as an energy source in active transport?

The sodium-potassium pump would be most active in cells of which of the following structures?

Which of the following components of the cell membrane is responsible for active transport?

Which of the following membrane proteins is involved in active transport?

Which membrane transport process consumes ATP and uses a carrier protein?

Why does active transport of molecules across a membrane require ATP?

Active transport requires an input of energy and can also generate voltages across membranes. Based on this information, which of the following statements is true?

Glucose can be moved into cells via an active transport mechanism when the concentration of glucose inside the cell is higher than the concentration of glucose outside the cell. This active transport mechanism moves glucose and sodium into the cell at the same time. The glucose moves up its gradient and the sodium moves down its gradient. Which of the following statements about this mechanism is accurate?

Which of the following statements about cotransport of solutes across a membrane is correct?

Consider the transport of protons and sucrose into a plant cell by the sucrose-proton cotransport protein. Plant cells continuously produce a proton gradient by using the energy of ATP hydrolysis to pump protons out of the cell. Why, in the absence of sucrose, do protons not move back into the cell through the sucrose-proton cotransport protein?

Which of the following correctly describes a general property of all electrogenic pumps?