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WHAT Substances transported across the plasma membrane by carrier molecules?
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Why are proteins and polysaccharides cannot be transported across a cell membrane by carrier proteins?
They are too large to be transformed by carrier proteins. They are moved across by Vesicles instead.
An example of a molecules transported by carrier protein?
Co-transport is when molecules or ions are transported across a membrane (in fixed ratios) at the same time. One example is the Na/Ca exchanger - which transports Na in and Ca out of the cell simultaneously.
What substances moves across the cell membrane with the help or carrier molecules?
Ions across a cell membrane. It is a form of passive transport. Ions such as sodium(Na+), potassium (K+), calcium (Ca2+), and chloride (Cl-). Each ion channel is usually specific for one type of ion.
Why do passenger molecules need to be helped by the carrier protein?
Some molecules can't go through the cell membrane.
The process by which glucose can pass through a cell membrane by combining with special carrier molecules is called?
Facilitated diffusion is the process by which glucose can pass through a cell membrane by combining with special carrier molecules.
Glucose and no other sugar is transported into cells by protein carrier molecules in the cell surface membrane. How do carrier molecules specifically recognize glucose?
the receptors on the protein carrier recognise glucose allowing it to enter the cell :)
What are two roles of the membrane proteins?
There are two main roles of the membrane proteins. Membrane proteins act as channels across the lipid bilayer. They also act as carrier molecules that transfer substances across the membrane.
Why are proteins and polysaccharides cannot be transported across a cell membrane by carrier proteins?
They are too large to be transformed by carrier proteins. They are moved across by Vesicles instead.
Which is a factor that determies whether a mole can cross a cell membrane?
Lipid solubility determines if it will diffuse across. The presence of specific protein carrier molecules determines if it will be transported across the membrane.
What is it called when molcules are transported across the cell membrane by carrier?
osmosis
What are the protein molecules in a cell membrane that assist in cell transport?
Protein molecules are responsible for membrane transport. In passive transport diffusion is the phenomenon in which molecules flow naturally from areas of high concentration to lower concentrations.
An example of a molecules transported by carrier protein?
Co-transport is when molecules or ions are transported across a membrane (in fixed ratios) at the same time. One example is the Na/Ca exchanger - which transports Na in and Ca out of the cell simultaneously.
How does a protein transport substances across a cell membrane?
carrier protein
What substances moves across the cell membrane with the help or carrier molecules?
Ions across a cell membrane. It is a form of passive transport. Ions such as sodium(Na+), potassium (K+), calcium (Ca2+), and chloride (Cl-). Each ion channel is usually specific for one type of ion.
What controls which substances can move in and out of a cell?
The cell membrane regulates the movement of substances in and out of the cell.How does it do this? The phospholipid bilayer is impermeable to most substances, allowing across only small, uncharged molecules such as those of oxygen, carbon dioxide, and water. The only way for other substances to cross the membrane is via transport proteins (channel and carrier proteins). These are selective, and therefore control what enters and what leaves the cell.
Why do passenger molecules need to be helped by the carrier protein?
Some molecules can't go through the cell membrane.
Carrier molecules in the plasma membrane are only required for active transport?
False
