객관식
The force driving simple diffusion is ________, while the energy source for active transport is ________.
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6. The Membrane
Active Transport
객관식
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?
A
Active transport can use ATP as its energy source and ensures that there is no voltage across the cell membrane.
B
Active transport moves solutes down their concentration gradients and always uses ATP as the source of energy to do this.
C
Active transport uses channel proteins and ensures that the interior of the cell is always positive compared to the exterior of the cell.
D
The source of energy for active transport of a solute up its gradient can be ATP or a concentration gradient of a second solute. This second gradient of solutes maintains no net difference in voltage across the membrane.
E
The sodium-potassium pump hydrolyzes ATP and results in a net positive change outside the cell membrane.
검증된 단계별 안내1
Understand that active transport is a process that moves molecules across a cell membrane against their concentration gradient, which requires energy input.
Recognize that ATP (adenosine triphosphate) is a common energy source for active transport processes, such as the sodium-potassium pump.
Identify that the sodium-potassium pump is a type of active transport that moves sodium ions out of the cell and potassium ions into the cell, using energy from ATP hydrolysis.
Acknowledge that the sodium-potassium pump creates an electrochemical gradient, resulting in a net positive charge outside the cell membrane due to the movement of more positive charges out than in.
Conclude that the statement about the sodium-potassium pump hydrolyzing ATP and resulting in a net positive change outside the cell membrane is true, as it accurately describes the function and outcome of this active transport mechanism.
