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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.
How does oxygen with a lower concentration inside a cell than outside the cell move across the plasma membrane?
Oxygen moves across the plasma membrane from an area of higher concentration (outside the cell) to an area of lower concentration (inside the cell) through a process called diffusion. This movement occurs because oxygen is a small, nonpolar molecule that can easily pass through the lipid bilayer of the membrane. Additionally, the concentration gradient drives the diffusion until equilibrium is reached.
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.
