Multiple Choice
In passive transport, how does increasing temperature generally affect the rate of diffusion across a membrane?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
Which of the following is an example of passive transport across a cell membrane?
A
Transport of glucose into a cell against its concentration gradient using ATP
B
Diffusion of oxygen () from a region of higher concentration to lower concentration
C
Movement of sodium ions () into the cell using the / ATPase pump
D
Endocytosis of extracellular fluid into the cell (pinocytosis)
Verified step by step guidance1
Understand the definition of passive transport: it is the movement of molecules across a cell membrane without the use of cellular energy (ATP), typically moving down their concentration gradient.
Identify the options that involve energy use: transport of glucose against its concentration gradient using ATP and movement of sodium ions using the Na+/K+ ATPase pump both require energy, so they are examples of active transport.
Recognize that endocytosis (pinocytosis) involves the cell engulfing extracellular fluid, which requires energy and membrane remodeling, so it is also an active process.
Focus on diffusion of oxygen (O\_2) from a region of higher concentration to lower concentration, which occurs naturally without energy input, fitting the criteria for passive transport.
Conclude that diffusion of oxygen is an example of passive transport because it moves down its concentration gradient without ATP.
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