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Facilitated diffusion requires the use of cellular energy ATP expenditure?
No, facilitated diffusion does not require the use of cellular energy (ATP). It relies on membrane transport proteins to help move molecules across the cell membrane with the concentration gradient, without needing energy input from the cell.
What role does a cellular membrane play in passive transport?
hahahah That's not even an answer. They act as barriers to the diffusion of certain substances. ---------------------------------------------------------------------------------- Better Answer: Well actually the membrane can facilitate diffusion (such as that of larger macromolecules) through channel proteins.
Identify at least five ways by which a substance may enter the cell?
A substance can enter a cell through diffusion, facilitated diffusion, active transport, endocytosis, or passive transport. Each of these processes has different mechanisms for moving substances across the cell membrane.
What substances would most likely require a protein to facilitate its diffusion across a cell membrane?
Quick answer: glucose Explanation: Any substance that the membrane selects against requires integral proteins to cross the membrane. B/c the lipid bilayer is selectively permeable, not all substances can pass through it by diffusion or osmosis. However, when the cell requires a substance that it's membrane does not easily allow to pass through, it must enter via the proteins in the membrane. They can either be carrier proteins or protein channels depending on the substance. One example of a substance which requires facilitated diffusion is glucose.
What movement of the substances through a cell membrane against a concentration gradient requires energy?
no because it is a form of passive transport. only active transport requires energy. facilitated diffusion just means that it cant be just absorbed through the membrane, it must go through specific chanels or be helped by transport proteins. but because facilitated diffusion moves from higher to lower concentrations, it requires no energy.
What are ways to maximise the rate of diffusion of a substance across a membrane?
To maximize the rate of diffusion of a substance across a membrane, you can increase the concentration gradient by maintaining high concentration levels on one side. You can also increase the surface area of the membrane for more contact between the substance and the membrane. Additionally, ensuring the membrane is thin and permeable will aid in faster diffusion.
Osmosis is the diffusion of what substance through a cell membrane?
Water
When does diffusion occur across a cell membrane?
Diffusion across a cell membrane occurs when concentrations of a substance are higher either inside or outside the cell.
What substance crosses the cell membrane by facilitated diffusion?
a sodium ion
The movement of material through a cell membrane without using cellular energyg?
"diffusion"
What happens in simple diffusion?
In simple diffusion, a substance passes through a membrane without any outside intermediary. The rate of diffusion is based on the force exerted..
What is one way that osmosis is the same as diffusion?
Osmosis and diffusion are the same because they are both ways that molecules are carried across the cellular membrane with the concentration gradient.
Facilitated diffusion requires the use of cellular energy ATP expenditure?
No, facilitated diffusion does not require the use of cellular energy (ATP). It relies on membrane transport proteins to help move molecules across the cell membrane with the concentration gradient, without needing energy input from the cell.
How can some substance diffuse through a cell membrane at faster rate than by diffusion alone?
In facilitated diffusion, there are temporary openings in the cell membrane that enable certain molecules to pass through quickly.
What role does a cellular membrane play in passive transport?
hahahah That's not even an answer. They act as barriers to the diffusion of certain substances. ---------------------------------------------------------------------------------- Better Answer: Well actually the membrane can facilitate diffusion (such as that of larger macromolecules) through channel proteins.
How would you define cellular diffusion?
Cellular diffusion is when molecules in the cell go from high concentration to low concentration to balance out the concentration. Small molecules can diffuse through the cell membrane, but larger molecules need the help of proteins. This is call facilitated diffusion.
What is A transporter protein that carries a substance across a cellular membrane against its concentration gradient?
pump
