Multiple Choice
Which of the following is an example of passive transport across a cell membrane?
48
views
9. Transport Across Membranes
Passive Transport: Diffusion and Osmosis
Multiple Choice
In the context of passive transport, simple diffusion across a plasma membrane requires __________.
A
vesicle formation and membrane fusion (endocytosis/exocytosis)
B
ATP hydrolysis to power transport against the gradient
C
a concentration gradient (movement from higher to lower solute concentration)
D
a membrane transport protein (carrier or channel) specific to the solute
Verified step by step guidance1
Understand that passive transport involves the movement of molecules across the plasma membrane without the input of cellular energy (ATP).
Recall that simple diffusion is a type of passive transport where molecules move directly through the lipid bilayer of the membrane.
Identify the key driving force for simple diffusion, which is the concentration gradient — molecules move from an area of higher concentration to an area of lower concentration.
Recognize that simple diffusion does not require membrane transport proteins, vesicle formation, or ATP hydrolysis.
Conclude that the essential requirement for simple diffusion is the presence of a concentration gradient across the plasma membrane.
Related Videos
Related Practice
