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How does the structure of the membrane speed up or help speed up certain molecule transport without the use of energy?
Wiki User
∙ 10y ago
Fluid membranes such as cellular membranes allow the passage of small and neutrally charged atoms and molecules, such as oxygen. In cells there are also carrier proteins that do not require ATP to transport larger molecules such as water.
Wiki User
∙ 10y ago
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What characteristic makes the cell membrane selectively permeable?
Passive and active transport. Passive transport doesn't require the cell's energy, while active transport does.
What is used to transport glucose across the cell membrane of certain cells?
frutose
How does active transport differ from the process of diffusion across a membrane?
Diffusion is the process in which a certain substance achieves equal concentrations in a specific area. Diffusion across a membrane means that the substance is equally distributed between both sides of the membrane, assuming the substance can pass through that membrane (the membrane is permeable to the substance).Active transport is just that, active. It requires energy because it is usually moving substances to a place where they would not naturally move or increases the rate of their disbursing. Active transport can move molecules against a concentration gradient, whereas diffusion cannot.Simply, active transport means that energy is needed to transport the object/molecule while diffusion is a naturally occurring process dependent on the concentration gradients between the membrane.
What does a cell membrane have that makes it easier for certain molecules to cross the cell membrane?
A simple answer is transport proteins. There are several types. Some require the use of energy, while other simply use a gradient to transport.
What is the function plasma membrane?
To let certain things pass in and out. since it only lets certain things in and out it is considered semipermeable. Water can pass through very easily because that molecule's is small, same with glucose. but then you get to something to large to pass through such as starch molecule's.
When does passive transport occurs?
It occurs when there are more of that certain molecule on the outside of the cell than the inside. When this is the case, the molecule will automatically pass through the membrane without the cell using energy.
What structure allows only certain things to pass in and out of a cell?
The cell membrane. It is a semi-permeable membrane (or selectively permeable membrane) - this means that it only lets certain certain molecules or ions pass in or out of the cell. Permeability may depend on the molecule's size, solubility, properties, or chemistry.
Which structure helps transport certain materials across the cell membrane?
The question is incomplete. No options (for which of the following) are given to answer the question.
What characteristic makes the cell membrane selectively permeable?
Passive and active transport. Passive transport doesn't require the cell's energy, while active transport does.
What is used to transport glucose across the cell membrane of certain cells?
frutose
What protein recognizes certain molecules bringing them across a membrane?
channel or transport or receptor
State one possible reason a certain substance can not pass across a cell membrane?
The cell membrane is selectively permeable. Some substances like molecules are too big to pass through the membrane. The membrane allows passive transport of moleculesÊ by filtration, diffusion, or osmosis.
What is the function of a transport protien?
it helps move certain substances such as water and sugar across the membrane.
How do you transport proteins in a cell make it easier for certain molecules to diffuse across a membrane?
If there's a transfer protein then its NOT diffusion ... its active transport.
How does active transport differ from the process of diffusion across a membrane?
Diffusion is the process in which a certain substance achieves equal concentrations in a specific area. Diffusion across a membrane means that the substance is equally distributed between both sides of the membrane, assuming the substance can pass through that membrane (the membrane is permeable to the substance).Active transport is just that, active. It requires energy because it is usually moving substances to a place where they would not naturally move or increases the rate of their disbursing. Active transport can move molecules against a concentration gradient, whereas diffusion cannot.Simply, active transport means that energy is needed to transport the object/molecule while diffusion is a naturally occurring process dependent on the concentration gradients between the membrane.
How do transport proteins make make it easier for certain molecules to diffuse across a membrane?
Facilitated diffusion is the diffusion of molecules.across a membrane through transport proteins. Transport proteins make it easier for molecules to enter or exit acell. But the process is still a form of passive transport.
What does a cell membrane have that makes it easier for certain molecules to cross the cell membrane?
A simple answer is transport proteins. There are several types. Some require the use of energy, while other simply use a gradient to transport.
