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Energy is only necessary for diffusion if the particles are being moved across the membrane against the gradient. ATP is necessary for this active transport as particles are moved from low concentrations to higher concentrations across the membrane.
This is because passive transport, which does not use energy, only works to move particles down their concentration gradient.
Ex. Such active transport is used in neuron cells to have a different charge inside and outside of the cell so that it can relay electric signals.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoThe plasma membrane of a cell is a lipid bi-layer, so the core is very hydrophobic. Ions are charged, so they are very polar. Because of this it is very difficult for them to pass through the non-polar core of the membrane. It the ions are given enough energy, they can pass through the membrane even if it is energetically unfavorable.
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How do lipid or oil get through plasma cell membrane?
Lipids or oil get through plasma membrane because plasma membrane is a selectively permeable membrane. It allows entry and exit of only some substances through it.
What Substances that can freely dissolve through the plasma membrane are made of?
Substances that can freely pass through the plasma membrane must be small and non-polar.
What is the function of the carbohydrates that stick out if the plasma membrane?
The carbohydrates help identify chemical signals and define the characteristics of the cell.
How does nutrients cross plasma membrane?
Things like oxygen, CO2 and lipids cross the membrane with simple diffusion. Water can cross the membrane with osmosis when the water moves through a channel protein in the plasma membrane. Glucose, potassium, sodium etc. moves through a carrier protein in the membrane with the process of active movement. In the process of active movement energy is needed and it is given by the glucose or ATP from the cell.
How does nutrients enter a cell?
The plasma membrane.
How do lipid or oil get through plasma cell membrane?
Lipids or oil get through plasma membrane because plasma membrane is a selectively permeable membrane. It allows entry and exit of only some substances through it.
What do you call the movement through the cell membrane?
permeation through the plasma membrane perhaps?
What Substances that can freely dissolve through the plasma membrane are made of?
Substances that can freely pass through the plasma membrane must be small and non-polar.
What is the part of the cell that materials pass through?
The membrane
What does not freely diffuse through the plasma membrane?
glucose
Where is glucose taken into cell?
through the plasma membrane
What is the function of the carbohydrates that stick out if the plasma membrane?
The carbohydrates help identify chemical signals and define the characteristics of the cell.
A non-energy requiring process that moves materials across a cell membrane with the concentration gradient.?
The process of moving materials across the cell membrane without the expenditure of energy is called passive transfer
How does nutrients cross plasma membrane?
Things like oxygen, CO2 and lipids cross the membrane with simple diffusion. Water can cross the membrane with osmosis when the water moves through a channel protein in the plasma membrane. Glucose, potassium, sodium etc. moves through a carrier protein in the membrane with the process of active movement. In the process of active movement energy is needed and it is given by the glucose or ATP from the cell.
How does nutrients enter a cell?
The plasma membrane.
What is the role of transport and channel proteins within the fluid mosaic of the plasma membrane?
They allow movement of salts and sugars through the plasma membrane
Is plasma membrane premeable?
The plasma membrane is selectively permeable; it allows some substances to pass through but prevents the passage of other substances
