Textbook Question
Write a single sentence, using no more than 25 words, to summarize each of the following cellular processes:
Primary active transport
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2. Cell Chemistry & Cell Components
Passive vs. Active Transport
Multiple Choice
Which of the following membrane movements is not a passive process?
A
Osmosis
B
Facilitated diffusion
C
Diffusion
D
Active transport
Verified step by step guidance1
Begin by understanding the concept of passive transport. Passive transport is a movement of ions and other atomic or molecular substances across cell membranes without the need for energy input. It relies on the concentration gradient.
Identify the processes listed: Osmosis, Facilitated diffusion, and Diffusion. All these are examples of passive transport. Osmosis is the movement of water across a semipermeable membrane, facilitated diffusion involves the use of transport proteins to move substances across membranes, and diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.
Contrast passive transport with active transport. Active transport requires energy, usually in the form of ATP, to move substances against their concentration gradient, from an area of lower concentration to an area of higher concentration.
Recognize that the question asks for the process that is not passive. Since active transport requires energy and moves substances against the concentration gradient, it is not a passive process.
Conclude that active transport is the correct answer to the question, as it is the only process listed that requires energy input and is not passive.
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