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They want to be a equilibrium (have the same concentration both inside and outside the semi-permeable membrane). Therefore they will move from a higher concentration to a lower in an effort to gain equilibrium. This does not require energy, unlike active transport.
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∙ 12y ago
Wiki User
∙ 11y agowork must be done to overcome the influences of diffusion and osmosis.
Wiki User
∙ 11y agoBecause these molecules are moving from an area of high concentration to an area of law concentration. So, they are moving as if on a down hill gradient.
Wiki User
∙ 11y agoThis question is circular in nature. It's like saying why is gravity needed for the appple to fall from the tree.
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∙ 13y agoMrs. Cebula
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What is the most important factor in explaining why diffusion occurs spontaneously?
the process of diffusion is when molecules of any substance spread out into available space. because diffusion always occurs moving from an area of high concentration to low concentration it is said to be moving down its concentration gradient and therefore no work must be done to move the substance. Because no work is being done, diffusion decreases free energy therefore making it a spontaneous process.
Which way do molecules move during active transport?
hii friends?? hws life?? i think acitve transport moves molecules throught the speed of light and it needs blood and carbon dioxide to go through this process!!! Good luck people who need this answer bye!!! by: gabriel
How does secondary active transport work?
Active transport requires energy (ATP, GTP, etc) to work against the electrochemical gradient. Passive transport works with the electrochemical gradient and does not require energy. (Think diffusion)
What type of ion is built into gradient so ATP synthase can work?
H+ ions (protons) are built into a gradient.
How do proteins that are pumps differ from those that are channels?
They differ mainly by their shapes but they are an integral part of the membrane itself. The ones that are channels are open in the center. They use no energy.The ones that are pumps do not have a free opening. Also these pumps use energy to allow them to work. This use of energy (ATP) causes them to move objects against the concentration gradient.
Does simple diffusion work with or against the concentration gradient?
I think that it is something
How can molecules move without diffusion or osmosis?
Apart from osmosis and diffusion the major mechanism for individual molecules to move is by active transport. Active transport is the movement of molecules against their concentration gradient (from a low to a high concentration) using energy supplied by the cell. It differs from diffusion which can only work down a concentration gradient ie from a high concentration to a low concentration. It also needs a source of energy supplied by a living cell, which is not needed for difusion. In cells, energy for active transport is supplied by respiration. See http://www.bbc.co.uk/schools/gcsebitesize/biology/cellprocesses/2diffusionandosmosisrev1.shtml
How is diffusion different from active transport?
active transport is different from diffusion. active transport has to do with the movement of chemical substance through a gradient of concentration. diffusion has to do with requiring the expenditure of energy
Does osmosis work with or against the concentration gradient?
against the gradient
What is the most important factor in explaining why diffusion occurs spontaneously?
the process of diffusion is when molecules of any substance spread out into available space. because diffusion always occurs moving from an area of high concentration to low concentration it is said to be moving down its concentration gradient and therefore no work must be done to move the substance. Because no work is being done, diffusion decreases free energy therefore making it a spontaneous process.
Why did whole milk move?
The whole milk moves because of diffusion.The molecules of milk diffuse thorugh the water as in simple diffusion, molecules diffueses from where it is more concentrated to where it is less concentrated to where it is less concentrated (diffusing down its concentration gradient). This leads to dynamic equilibrium; the solute molecules of mile continue to cross the membrane but at equal rates in both directions. Diffusion is a spontaneous process, needing no input of energy. No work must be done to move substances down the concentration gradient.
A form of passive transport that uses transport proteins-?
Diffusion (passive transport) needs no energy to take place, and therefore no need for transport or carrier protiens. Active transport uses carrier protiens, as the cell needs to work against a concentration gradient. This requires energy. Diffusion can take place outside of cells Active transport can't take place outside of cells.
Which way do molecules move during active transport?
hii friends?? hws life?? i think acitve transport moves molecules throught the speed of light and it needs blood and carbon dioxide to go through this process!!! Good luck people who need this answer bye!!! by: gabriel
What types of transport moves molecules along a concentration gradient?
I'm not sure you're understanding the question you are asking. Molecules are the tiny building blocks, made up of atoms, that are used to create everything in our galaxy. Cells are a single living unit that work together to be a living thing. If you are interested in how parts of a cell move around or pass along material, you should look up how cells work or ask a more specific question.
How do faciliated diffusion and active transport differ?
In active transport, the molecules are carried against the force of diffusion. This is the opposite of facilitated transport. Also in active transport, energy in the form of ATP is required, since the molecules move against the normal flow. Note that energy is not needed in facilitated transport. Bard, Susan, Mary Alice Jost. Multimediated Lectures in Biology. Seventh Edition. Howard Community College, MD. 2003. ---------------------------------------------------------------------- *Active transport: Transport of molecules AGAINST the concentration gradient with the use of a PROTEIN CARRIER. This uses ATP. Facilitated transport: Moving of molecules through a semi permeable membrane witht he use of the cell's "facility's" AKA Protein carriers or Channels. *Gowda, Vishal. 10th Grade AP Biology Student. How about that? 2008 son!
What is transportation work?
"In transport work, ATP drives the active transport of solutes across a membrane against their concentration gradient by phosphorylating transport proteins". (Solutes are transported.) Save the animals!! :D
Do molecules need energy to get in and out of the cell?
To clarify the question: the molecules do not need energy to enter or exit the cell, the cells need to spend the energy to get some molecules in or out--however, the answer to your question is: It depends on the molecule, and the cell.Molecules can move into and out of cells by two broad methods: Passive transport, and Active transport.Passive transport requires no energy and involves diffusion (the moving of the molecule from an area of high concentration to low concentration WITH its concentration gradient--it spreads out, into the areas where there isn't any already). One type of diffusion is regular diffusion for molecules that can pass through the membrane (these molecules are said to be "lipophilic" as they interact with the lipid membrane easily). Another type of diffusion is facilitated diffusion--the molecule uses an open channel in the cell to move (does not pass through the membrane by itself). However, the channel is open and does not require energy to function.Active transport requires energy to work. These can be gated channels, "pumps" and other types of transport proteins. Active transport usually moves molecules AGAINST their concentration gradient (from low concentration to high concentration). This is the opposite of diffusion. Remember, the cell is paying this energy debt, not the molecule.In general, lipophilic (hydrophobic) molecules usually do not need energy to cross the cell membrane while lipophobic (hydrophilic) molecules do. The lipophobic molecules often carry a charge (positive or negative) which renders them unable to pass through the membrane, though just a partial charge (polarity) can be enough to keep them in our out. In contrast the lipophilic molecules are electronically neutral and not polar.
