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What drives the diffusion of substances across a membrane?
The diffusion of substances across a membrane is driven by the concentration gradient, which is the difference in concentration of a substance on either side of the membrane. Substances naturally move from areas of high concentration to areas of low concentration in order to reach equilibrium.
What is the function of a transport protien?
it helps move certain substances such as water and sugar across the membrane.
The use of energy to move substances across a cell membrane describes?
Active transport, which requires energy in the form of ATP to move substances against their concentration gradient across a cell membrane. This process involves specific protein pumps that bind to the molecule being transported, consuming ATP to change conformation and move the molecule across the membrane.
What term identifies the concept that some substances can move freely across a cell membrane while other substances must be carried across by proteins?
selective permeability
How does active transport work against the concentration gradient to move substances across a cell membrane?
Active transport is a process in which cells use energy to move substances against their concentration gradient, from an area of low concentration to an area of high concentration, across the cell membrane. This is achieved by using specialized proteins called pumps that actively transport the substances across the membrane, requiring energy in the form of ATP.
Do enzymes change shape to move substances across the plasma membrane?
Enzymes and the substrates they work on fit like a lock and key, if you change the shape of the key, the lock won't open. An enzyme whose shape changes is no longer able to activate the reaction of the substrate.
What is the barrier around the that lets substances move across it?
Cell membrane is the barrier around the cell that allows certain substances to move across it. It is selectively permeable, meaning it controls the movement of molecules in and out of the cell. This helps maintain the internal environment of the cell and ensures proper functioning.
How does the process of flux through a membrane contribute to the movement of substances across biological barriers?
The process of flux through a membrane helps substances move across biological barriers by allowing them to pass through the membrane from an area of high concentration to an area of low concentration. This movement is driven by the natural tendency of substances to reach equilibrium, where the concentration is the same on both sides of the membrane.
Active transport requires what?
Energy-requiring process by which substances move across the plasma membrane against a concentration gradient.
Which type of transport is the coupled passage of two materials across a membrane?
Symport is the type of transport that involves the coupled passage of two materials across a membrane in the same direction. It relies on a concentration gradient to move both substances across the membrane simultaneously.
How can substances move across capillaries?
Substances typically move across capillaries via diffusion.
Which type of molecule can move passively across the membrane?
Small and non-polar molecules, such as oxygen and carbon dioxide, can move passively across the membrane through simple diffusion. This process does not require energy and occurs in the direction of the concentration gradient, from an area of higher concentration to lower concentration.
