Multiple Choice
Which of the following is a passive process?
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6. The Membrane
Passive vs. Active Transport
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Which of the following describes passive transport?
A
Movement of molecules down their concentration gradient without energy input
B
Facilitated diffusion requiring energy input
C
Movement of molecules against their concentration gradient using ATP
D
Transport of molecules via vesicles requiring energy
Verified step by step guidance1
Understand the concept of passive transport: Passive transport is the movement of molecules across a cell membrane without the need for energy input from the cell.
Identify the key characteristic of passive transport: It involves the movement of molecules down their concentration gradient, meaning from an area of higher concentration to an area of lower concentration.
Differentiate passive transport from active transport: Active transport requires energy, often in the form of ATP, to move molecules against their concentration gradient.
Recognize examples of passive transport: Simple diffusion and facilitated diffusion are types of passive transport. Facilitated diffusion involves transport proteins but does not require energy.
Evaluate the options given: The correct description of passive transport is the movement of molecules down their concentration gradient without energy input. Other options involve energy input or movement against the gradient, which are not characteristics of passive transport.
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