THE CELL
TRANSPORT INTO AND OUT OF THE CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Substances cross the cell membrane through protein channels.
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Substances are “engulfed” by a vesicle, which crosses the cell membrane
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Substances are “engulfed” by a cell’s plasma membrane to form a channel into the cell.
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Substances are “engulfed” by a cell’s plasma membrane and brought into the cell in a vesicle.
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Detailed explanation-1: -Endocytosis is the process of capturing a substance or particle from outside the cell by engulfing it with the cell membrane, and bringing it into the cell. Exocytosis describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell.
Detailed explanation-2: -Diffusion, osmosis and active transport are three main ways that molecules and ions can move into and out of cells through the membrane.
Detailed explanation-3: -The simplest mechanism by which molecules can cross the plasma membrane is passive diffusion. During passive diffusion, a molecule simply dissolves in the phospholipid bilayer, diffuses across it, and then dissolves in the aqueous solution at the other side of the membrane.
Detailed explanation-4: -Complete answer: Endocytosis is defined as the process of trapping a particle or even a substance from the external environment by the process of engulfing it. The flexibility of the cell membrane helps the cell to engulf the food and also other materials from the external environment.