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Is passive transport able to occur against the concentration gradient?

No, passive transport cannot occur against the concentration gradient. It only moves substances from an area of high concentration to an area of low concentration.


Do greatest changes in weight occur in cells with steepest concentration gradients?

Yes, cells with steeper concentration gradients will experience greater changes in weight as water moves in or out of the cell to maintain equilibrium with its environment. This weight change occurs due to osmosis, where water moves across a semi-permeable membrane to equalize solute concentrations on both sides.


What side of the membrane has a high concentration of solute and which has a low concentration?

The side of the membrane with a high concentration of solute is the hypertonic side, while the side with a low concentration is the hypotonic side. Diffusion will occur from the side of high concentration to the side of low concentration until equilibrium is reached.


How does the movement of molecules occur down a concentration gradient?

The movement of molecules down a concentration gradient happens through a process called diffusion. This is when molecules move from an area of high concentration to an area of low concentration, driven by the natural tendency of particles to spread out evenly. This movement continues until the concentration is balanced throughout the system.


Can diffusion occur without membrane?

Diffusion is the movement of molecules kineticly from an area of high concentration to an area of low concentration until they are evenly distributed. Osmosis is the movement of molecules thru a membrane.