Multiple Choice
Which type of cellular transport does not require energy input from the cell?
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6. The Membrane
Passive vs. Active Transport
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Which of the following best describes the force driving simple diffusion across a biological membrane?
A
ATP hydrolysis
B
Carrier protein conformational change
C
The concentration gradient of the solute
D
Electrical impulses
Verified step by step guidance1
Understand the concept of simple diffusion: Simple diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration, down their concentration gradient, without the need for energy input or assistance from proteins.
Eliminate options that involve energy input: ATP hydrolysis involves the breakdown of ATP to release energy, which is not required for simple diffusion. Therefore, this option is incorrect.
Eliminate options involving proteins: Carrier protein conformational changes are associated with facilitated diffusion or active transport, where proteins assist in moving molecules. Simple diffusion does not involve proteins, so this option is also incorrect.
Consider the role of electrical impulses: Electrical impulses are involved in processes like nerve signaling, not in the passive movement of molecules across membranes. Thus, this option is not relevant to simple diffusion.
Identify the correct driving force: The concentration gradient of the solute is the key factor driving simple diffusion, as molecules naturally move from areas of higher concentration to areas of lower concentration to achieve equilibrium.
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