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Question
Which of the following processes cause substances to move across membranes without the expenditure of cellular energy?
Which of the following processes cause substances to move across membranes without the expenditure of cellular energy?
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Solution
The correct option is C Diffusion
Endocytosis is an energy-using process by which cells absorb molecules by engulfing them.
Exocytosis is also an energy consuming process by which a cell directs the contents of secretory vesicles out of the cell membrane and into the extracellular space.
Active transport is the movement of molecules across a cell membrane in the direction against their concentration gradient, i.e., moving from a low concentration to a high concentration and this uses cellular energy.
Passive transports like diffusion do not require additional expenditure of cellular energy during the movement of a substance from a region of high concentration to a region of low concentration, i.e., along with the concentration gradient.
Endocytosis is an energy-using process by which cells absorb molecules by engulfing them.
Exocytosis is also an energy consuming process by which a cell directs the contents of secretory vesicles out of the cell membrane and into the extracellular space.
Active transport is the movement of molecules across a cell membrane in the direction against their concentration gradient, i.e., moving from a low concentration to a high concentration and this uses cellular energy.
Passive transports like diffusion do not require additional expenditure of cellular energy during the movement of a substance from a region of high concentration to a region of low concentration, i.e., along with the concentration gradient.
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