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What are the functions that cell membranes perform?
they help transport some substances through the membrane
active transport reguires?
Active transport requires some form of energy input, usually ATP
What property in the cell membrane that allows only some substances in?
Semi-permeable. Permeable means things can pass through, so semi-permeable means only some things can pass through.
What is the process of taking material into a cell?
There are a huge number of ways that this can occur. Water can simply diffuse through the cell membrane through osmosis, while other substances diffuse through special channels in the cell membrane. Some substances have to be brought into the cell through active transport, which requires the use of ATP.
What characteristics is more likely to make a substance diffuse through the cell membrane?
Size. Actually very few substances are able to diffuse across the menbrane, most must be transported ie facilitated diffusion, active transport, or receptor-mediated endocytosis. Carbon dioxide, oxygen, water, and some lipid substances are able to diffuse across the membrane
What are the functions that cell membranes perform?
they help transport some substances through the membrane
What function do protein perform in the cell membrane?
They help move material in and out of the cell.Read more:They help transport some substances through the membrane :)MORE: Membrane proteins are also important for endocytosis and cell signalling.
Why is the plasma membrane more permeable to potassium ions than sodium ions?
Some substances, including sodium and potassium, use a process called active transport to permeate cell walls. Active transport is controlled by other body systems. It limits the quantity of these substances passing through the plasma membrane to match the needs of the body.
active transport reguires?
Active transport requires some form of energy input, usually ATP
Could an organism survive only by using passive transport never active transport?
There's an almost infinite number of organisms out there and I wouldn't be overly surprised if some could, but generally speaking, cells need active transport to maintain control over the substances entering and exiting. At the expense of some enrgy, active transport allows cells to control to some extent the molecules that are allowed to cross the plasma membrane. A basic example would be to say that in most human cells, waste products are secreted by active transport so without such a process there would be a toxic buildup in the cell; and also that glucose requires active transport to enter a cell so without it, the cell would have no form of energy and die
Why is active transport of molecules necessary?
To move substances from low to high concentration.
What are three ways molecules can cross the cell membrane?
cell membrane is a lipid bi-layer which allows only fat soluble sunstances to pass through and the remaining essential materials pass with the help of carrier protien..so on this basis the transport is of two types(1) active transport: Active transport uses energy(2) passive transport : does not use any energycheck it out : active-transport
What property in the cell membrane that allows only some substances in?
Semi-permeable. Permeable means things can pass through, so semi-permeable means only some things can pass through.
Is the transporting of molecules from the blood capillaries to body tissuse by active transport or bulk transport?
Neither except in the case of the sodium potassium pump. Transport of "molecules" is by osmotic pressure at the capillary bed and by and concentration gradient/ diffusion at the actual cell membranes.
Compare the contrast pasive and active cell transport process?
Passive transport is when materials move through the cell membrane without using energy. Active transport is when materials move through the cell membrane using the cell's energy. During Active transport a protein called ATP helps the material get through the cell membrane.
What is the transport of materials against a concentration gradient called?
The process of moving materials against a concentration gradient is called active transport. Active transport generally uses a protein pump to move molecules from an area of low concentration to an area of high concentration; in order to perform an active transport, the cell must use some of its energy to initiate the reaction.
What process changes the shape of transport proteins when a particle binds with it?
Carrier Proteins. Some don't require ATP (Facillitated transport) and some do require ATP (Active transport) to change shape.
