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How do most molecules cross the cell membrane?
Most molecules cross the cell membrane through passive diffusion, facilitated diffusion, or active transport. Passive diffusion relies on the concentration gradient, facilitated diffusion involves the use of protein channels or carriers, and active transport requires energy to move molecules against their concentration gradient.
Why urea can't cross membranes?
Passive diffusion - Urea has its own concentration gradient so it will go from an area of high concentration through the cell membrane into an area of lower concentration.
What two ways could you expect the movement of water into a cell by osmosis to be similar to the diffusion of oxygen?
Both osmosis and diffusion of oxygen are passive processes that occur from areas of high concentration to areas of low concentration. Additionally, both processes are influenced by the concentration gradient of the substances involved.
How would you define cellular diffusion?
Cellular diffusion is when molecules in the cell go from high concentration to low concentration to balance out the concentration. Small molecules can diffuse through the cell membrane, but larger molecules need the help of proteins. This is call facilitated diffusion.
What factor determines the direction of diffusion?
The concentration gradient for that substance determines the direction of net movement of molecules in passive transport.For example:When the concentration is high or that substance, it would move from the higher concentration to a lower concentration. And vice versa.
How do most molecules cross the cell membrane?
Most molecules cross the cell membrane through passive diffusion, facilitated diffusion, or active transport. Passive diffusion relies on the concentration gradient, facilitated diffusion involves the use of protein channels or carriers, and active transport requires energy to move molecules against their concentration gradient.
Why urea can't cross membranes?
Passive diffusion - Urea has its own concentration gradient so it will go from an area of high concentration through the cell membrane into an area of lower concentration.
Why does active transport require more energy than osmosis or facilitated diffusion?
Active transport requires more energy than diffusion this is because during active transport, the molecules are being transported against and toward the concentration gradient whereas in diffusion, the molecules go from the concentration gradient.
Why does active transport require more energy than osmosis or faciliated diffusion?
It is because during active transport, the molecules are being transported against and toward the concentration gradient whereas in diffusion, the molecules go from the concentration gradient.
Does diffusion cause a concentration gradient?
Diffusion is the result of a concentration gradient. When there is a higher concentration of a substance on one side of a barrier than on the other side, the molecules move across the barrier to try and establish equilibrium. This process is diffusion. Diffusion of water is specifically called osmosis. While diffusion occurs in living things, equilibrium is never reached. In an organism, equilibrium is the result of death.
How are facilitated diffusion and active transport similar ad how do the differ?
both these processes do the transport against the concentration gradient uh no facilitated diffusion doesnt go against the gradient, the similiarity is that they both use carrier protiens
What isit called when a molecule moves across a semipermeable membrane into a region of higher concentration?
When a molecule moves to a higher concentration it needs help of a pump. We call this facilitated diffusion. Osmosis only deals with the movement of water.
What movement of the substances through a cell membrane against a concentration gradient requires energy?
no because it is a form of passive transport. only active transport requires energy. facilitated diffusion just means that it cant be just absorbed through the membrane, it must go through specific chanels or be helped by transport proteins. but because facilitated diffusion moves from higher to lower concentrations, it requires no energy.
How would you define diffusion?
Cellular diffusion is when molecules in the cell go from high concentration to low concentration to balance out the concentration. Small molecules can diffuse through the cell membrane, but larger molecules need the help of proteins. This is call facilitated diffusion.
What is the differences between simple and active diffusion?
Simple diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration without the use of a protein carrier. Active diffusion, on the other hand, requires energy input and often utilizes protein carriers to move molecules against their concentration gradient, from an area of lower concentration to an area of higher concentration.
What are the 3 ways that things go in and out of cells?
Passive transport: molecules move across the cell membrane without requiring energy, through processes like diffusion and osmosis. Active transport: molecules move across the cell membrane using energy, often against a concentration gradient. Facilitated diffusion: molecules move across the cell membrane with the help of specific carrier proteins, still following the concentration gradient.
Why is energy needed for transport?
Molecules are moving against a 'concentration' gradient. Active transportation moving from low to high concentration, while passive transportation such as osmosis and diffusion go from high to low concentration.
