Multiple Choice
Which of the following is an example of passive transport across a membrane?
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6. The Membrane
Passive vs. Active Transport
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Which statement best describes passive transport?
A
It involves the engulfing of particles by the cell membrane.
B
It involves the movement of substances down their concentration gradient without the use of energy.
C
It requires energy to move substances against their concentration gradient.
D
It uses transport proteins to move substances against their concentration gradient.
Verified step by step guidance1
Understand the concept of passive transport: Passive transport is a biological process where substances move across cell membranes without the need for energy input from the cell.
Identify the concentration gradient: In passive transport, substances move from an area of higher concentration to an area of lower concentration, following their concentration gradient.
Recognize the types of passive transport: Common types include diffusion, facilitated diffusion, and osmosis, all of which do not require cellular energy.
Differentiate from active transport: Active transport requires energy to move substances against their concentration gradient, whereas passive transport does not.
Select the correct statement: The statement that best describes passive transport is 'It involves the movement of substances down their concentration gradient without the use of energy.'
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