Multiple Choice
Which of the following describes a form of passive transport?
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6. The Membrane
Passive vs. Active Transport
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During active transport, in which direction do particles move across a cell membrane?
A
Randomly, without regard to concentration gradient
B
From an area of lower concentration to an area of higher concentration
C
From an area of higher concentration to an area of lower concentration
D
Only along the concentration gradient
Verified step by step guidance1
Understand the concept of active transport: Active transport is a process where particles move across a cell membrane against their concentration gradient, requiring energy input, typically in the form of ATP.
Identify the direction of movement: In active transport, particles move from an area of lower concentration to an area of higher concentration, which is opposite to the natural flow of diffusion.
Recognize the role of energy: Since this movement goes against the concentration gradient, it requires energy. This energy is often provided by ATP molecules, which are hydrolyzed to release energy.
Consider the involvement of transport proteins: Active transport relies on specific proteins embedded in the cell membrane, such as pumps (e.g., sodium-potassium pump), to facilitate the movement of particles.
Eliminate incorrect options: Review the provided choices and eliminate options that describe passive processes (e.g., diffusion or movement along the concentration gradient) or random movement, as these do not align with the definition of active transport.
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