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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!
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ProfessorFacilitated diffusion is a passive process where molecules move across a membrane with the help of transport proteins, following their concentration gradient. Active transport requires energy input (ATP) to move molecules against their concentration gradient with the help of transport proteins.
In facilitated diffusion the substance move from higher concentration to lower concentration. In this transfer it is helped by the carrier molecule. For example absorption of glucose in the intestine and transfer of amino acids in the brain. In active transport the substance is transferred against the concentration gradient. For this essentially, the energy is required. For example absorption of amino acids across the wall of small intestine and absorption of levodopa in small intestine.
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In what ways are active transport and facilitated diffusion similar?
Active transport and facilitated diffusion are similar in that they both involve the movement of molecules across a cell membrane, but they differ in that active transport requires energy input from the cell, while facilitated diffusion does not.
How does faciliated diffusion differ from simple diffusion?
Facilitated diffusion is a type of passive transport that involves the movement of molecules across a cell membrane with the help of specific transport proteins. In contrast, simple diffusion is also a type of passive transport, but it does not require the presence of transport proteins and relies solely on the concentration gradient for movement of molecules across the membrane.
How does active transport differ from diffusion?
Active transport requires energy to move molecules across a cell membrane against their concentration gradient, while diffusion occurs spontaneously and does not require energy. Active transport is selective and can move molecules against their concentration gradient, while diffusion moves molecules from an area of high concentration to an area of low concentration.
How do the roles of protein molecules in diffusion differ and active transport?
Proteins are involved in passive diffusion as channels or carriers that facilitate the movement of molecules across a membrane based on concentration gradients. In active transport, proteins use energy to actively transport molecules against their concentration gradient, requiring ATP to drive the process.
How do facilitated diffusion and active transport compare and contrast in terms of their mechanisms of transport across the cell membrane?
Facilitated diffusion and active transport are both ways that substances move across the cell membrane, but they differ in their mechanisms. Facilitated diffusion uses protein channels to help substances passively move from areas of high concentration to low concentration, while active transport requires energy to move substances against their concentration gradient using protein pumps.
