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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.
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What term describes the difference in the concentrations of a substance across a cell's membrane?
The term that describes the difference in concentrations of a substance across a cell's membrane is called the concentration gradient. This gradient drives the movement of substances such as ions or molecules across the membrane through processes like diffusion or active transport to achieve equilibrium.
What is the difference between simple diffusion and facilitated diffusion?
It doesn't. (answer by RRU member Cyrem)
What drives the processes of diffusion and osmosis?
Diffusion is driven by the random movement of particles from an area of high concentration to an area of low concentration, seeking equilibrium. Osmosis, a specific type of diffusion involving water, is driven by the concentration gradient of solute particles across a semi-permeable membrane, causing water to move from an area of low solute concentration to high solute concentration.
Which molecules are responsible for creating a chemiosmotic gradient?
Protons (H+) are the main molecules responsible for creating a chemiosmotic gradient across biological membranes. In cellular respiration, the electron transport chain pumps protons across the inner mitochondrial membrane, creating a gradient that drives ATP synthesis through ATP synthase.
Why does salt is used in osmosis?
Salt is used in osmosis to create a concentration gradient that drives the movement of water molecules across a semi-permeable membrane. This helps regulate the flow of water in a biological system or can be used to separate substances through the process of reverse osmosis.
What term describes the difference in the concentrations of a substance across a cell's membrane?
The term that describes the difference in concentrations of a substance across a cell's membrane is called the concentration gradient. This gradient drives the movement of substances such as ions or molecules across the membrane through processes like diffusion or active transport to achieve equilibrium.
What is the significance of the concentration gradient in the process of diffusion?
The concentration gradient is important in diffusion because it drives the movement of particles from areas of high concentration to areas of low concentration. This process allows for the equalization of substances across a membrane or barrier, which is essential for maintaining balance and proper functioning within cells and organisms.
What drives diffusion?
Diffusion is driven by the random movement of particles or molecules from an area of higher concentration to an area of lower concentration. This movement occurs to reach equilibrium and minimize the concentration gradient. Temperature, pressure, and molecular weight can also affect the rate of diffusion.
What distinguishes facilitated diffusion from simple diffusion?
Simple diffusion allows non-polar molecules to pass through and a little amount of H20. On the other hand, Facilitated diffusion allows ions and polar molecules across the membrane because it contains carrier proteins. It is highly specific to substances it diffuses across the membrane.
What process drives molecules across a membrane against a concentration gradient?
Active transport is the process that drives molecules across a membrane against a concentration gradient, requiring energy input in the form of ATP. This process allows cells to accumulate substances they need in higher concentrations than their surroundings.
Is concentration gradient a form of potential energy?
Yes, a concentration gradient represents potential energy in the form of chemical potential energy. This energy arises from the difference in concentration of a substance across a membrane, and it can be used to drive processes like diffusion or active transport.
What term describes the different in the concentrations of a substance across a cell's membrane?
concentration gradient
Why is facilitated diffusion different from diffusion?
A sodium potassium pump is different from diffusion cos, it requires energy (ATP), and therefore is a active transport. Rather then diffusion which is the passive transport of solutions across cell membranes without using energy, and is determined by the concentration gradient.
What is the difference between simple diffusion and facilitated diffusion?
It doesn't. (answer by RRU member Cyrem)
What drives the processes of diffusion and osmosis?
Diffusion is driven by the random movement of particles from an area of high concentration to an area of low concentration, seeking equilibrium. Osmosis, a specific type of diffusion involving water, is driven by the concentration gradient of solute particles across a semi-permeable membrane, causing water to move from an area of low solute concentration to high solute concentration.
What is essential for diffusion?
A- A Concentration Gradient B- A Selectively Permeable Membrane C- A Source of Energy D- A Protein The Answer Is (A) Diffusion can occur without a semipermeable membrane, as diffusion is simply movement of a substance from high to low concentration. A source of energy is needed only for active transport. Proteins are needed if the the particles transported are too big to pass the semipermeable membrane.
How does facilited diffusion differ from diffusion?
Facilitated diffusion is a process whereby a substance passes through a membrane with a aid of an intermediary or a facilitator. The facilitator is an integral membrane protein that spans the width of the membrane. The force that drives the molecule from one side of the membrane to the other is the force of diffusion. and Diffusion is the process of movement of a substance from the region of higher concentration to the region of lower concentration so as to spread uniformly. Difference : Facilitated diffusion is when polar or charged molecules cross the cell membrane through a trans membrane channel protein. Diffusion is when small, non-polar molecules cross the cell membrane directly through the lipid bilayer. they can do so as they are hydrophobic and hence can pass through the hydrophobic core of the lipid bilayer. crossing the lipid bilayer is difficult for charged/polar particles as they are hydrophilic and large (as they may have hydration shells due to their charged nature), hence they have to cross through transport proteins.
