Monday, December 23, 2013

Membrane Transport Proteins

Part A

Correct
Membrane proteins facilitate the movement of molecules across the membrane.
Part B

Correct
This pump uses the energy provided by ATP hydrolysis to transport sodium and potassium ions across the membrane.
Part C

Correct
Active transport requires the input of energy, whereas passive transport is primarily driven by the gradient.Active transport requires energy, whereas passive transport does not.
Part D

Correct
The GLUT-1 transporter assists the diffusion of glucose through the membrane.
Part E

Correct
Ions tend to move toward regions of unlike charge.
Part F

Correct
The sodium-potassium pump maintains a state in which the concentration of sodium is low inside the cell relative to the outside and the concentration of potassium is high inside the cell relative to the outside; thus, three sodium ions are pumped out of the cell and two potassium ions are pumped into the cell against the electrochemical gradient.
Part G

Correct
Under these conditions, lactose moves against its concentration gradient, so its transport will require energy.

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