Multiple Choice
A red blood cell will undergo hemolysis when placed in which type of solution?
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9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In passive transport, what is the primary driving force for simple diffusion of a solute across a membrane?
A
A concentration gradient (difference in solute concentration across space)
B
Vesicular transport via endocytosis moving solute into the cell
C
ATP hydrolysis providing energy to move solute against its gradient
D
A membrane potential that directly powers movement of nonpolar solutes
Verified step by step guidance1
Understand that passive transport involves the movement of molecules across a membrane without the input of cellular energy (ATP).
Recognize that simple diffusion is a type of passive transport where solutes move from an area of higher concentration to an area of lower concentration.
Identify the primary driving force for simple diffusion as the concentration gradient, which is the difference in solute concentration across the membrane.
Note that other options like vesicular transport, ATP hydrolysis, or membrane potential involve active processes or different mechanisms, not simple diffusion.
Conclude that the solute moves down its concentration gradient until equilibrium is reached, which is the fundamental principle behind simple diffusion in passive transport.
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