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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move across the membrane to the outside of the cell.
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stop moving across the membrane.
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continue to move across the membrane in both directions.
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move across the membrane to the inside of the cell.
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Detailed explanation-1: -During diffusion, when the concentration of molecules on both sides of a membrane is the same, the molecules will continue to move across the membrane in both directions. When the concentration of the molecules reaches its equilibrium between the outer and inner parts of the membrane, it exists in dynamic equilibrium.
Detailed explanation-2: -When the concentration of a solute is equal on both sides of a membrane, the two solutions (inside and outside the membrane) are said to be isotonic. This does not mean that there is no movement through the membrane, however, just that the movement is such that the concentrations stay the same.
Detailed explanation-3: -the rate of diffusion decreases. Diffusion continues to occur until there is an equal concentration of particles on both sides of a semi-permeable membrane. the random movement of molecules.-the chemical would have to collide with and push through fewer molecules as it spreads out.
Detailed explanation-4: -Other factors being equal, a stronger concentration gradient (larger concentration difference between regions) results in faster diffusion. Thus, in a single cell, there can be different rates and directions of diffusion for different molecules.