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Some substances are too large to pass through the cell membrane via osmosis or diffusion. Additionally, some substances require specific carrier proteins or energy input to be transported across the membrane. Finally, certain substances may need to move against their concentration gradient, which cannot be achieved through osmosis or diffusion alone.

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Related Questions

Why aren't osmosis and simple diffusion sufficient for the transport of all substances?

Osmosis and simple diffusion are not sufficient for the transport of all substances due to their nature. They only have the ability to transport substances which can pass through the cell membrane.


What 3 ways can substances enter and leave a cell?

Substances can move in and out of a cell in several ways. Diffusion is when a substance will distribute itself in or out of a cell until the distribution on both sides of the cell is balanced. Active transport is when a cell transports a substance across the cell membrane that would not normally be able to pass through. Osmosis is the movement of water from areas with few dissolved dissolved substances to areas with high dissolved substances.


Osmosis and diffusion are examples of passive transport?

Yes, osmosis and diffusion are both examples of passive transport.


Are diffusion and osmosis types of active transport?

No, diffusion and osmosis are passive transport processes, not active transport. Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration, while osmosis is the movement of water across a selectively permeable membrane. Active transport, on the other hand, requires energy and moves substances against their concentration gradient.


What is net movement of substances across plasma membrane without additional energy?

Diffusion. With the need of energy, it would be called active transport.


Are diffusion and osmosis passive or active transports?

Diffusion and osmosis are passive and do not require energy.


How does diffusion from active transport?

Active transport expends energy, unlike osmosis and diffusion. Active transport is a way to move substances against concentration gradients in the cell membrane, so they need more energy to do so.


Is diffusion and osmosis both active transport?

no they are passive transport


What are the types of passive transport?

diffusion and osmosis


What are types of passive transport?

diffusion and osmosis


What are some examples of passive transport?

diffusion facilitated diffusion osmosis


What are three example of passive transport?

Diffusion Facilitated Diffusion Osmosis