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This is a process by which substances are transported across cell membranes by means of protein carrier molecules.?
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How do carrier proteins transport substances across membranes?
They control what enters and exits the cell :)
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.
How does facilitated diffusion work?
It is a passive process utilizing a protein carrier or channel.
Are both zinc and iron transported in the blood by a fat carrier?
No. Its by a protein carrier.
What are proteins found in cell membranes that transport large molecules?
carrier molecules
How do carrier proteins transport substances across membranes?
They control what enters and exits the cell :)
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 substances act like carrier molecules that facilitate chemical reactions?
Enzymes
Definition of facilitated?
Facilitated diffusion (or facilitated transport) is a process of diffusion, a form of passive transport. Polar molecules and charged ions are dissolved in water but they can not diffuse freely across cell membranes due to the hydrophobic nature of the lipids that make up the lipid bilayers. Only small nonpolar molecules, such as oxygen can easily diffuse across the plasma membrane. All polar molecules should be transported across membranes by proteins that form transmembrane channels. These channels are gated so they can open and close, thus regulating the flow of ions or small polar molecules. Larger molecules are transported by transmembrane carrier proteins, such as permeases that change their conformation as the molecules are carried through, for example glucose or amino acids.
What substances are too large for carrier proteins?
Glucose...It's a HUGE molecule that is broken down into Glycogen for storage.
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.
In a sodium-potassium pump what molecules are moved and where are they moved to?
In a sodium-potassium pump a carrier protein uses ATP in Active transport. The sodium ions are transported out of the cells and the potassium ions are transported into the cell.
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 facilitated diffusion work?
It is a passive process utilizing a protein carrier or channel.
What occurs when substances move against the concentration gradient requires and the aid of carrier proteins?
Carrier molecules are molecules that play a role in transporting electrons through the electron transport chain. Carrier molecules are usually proteins bound to a nonprotein group; they can undergo oxidation and reduction relatively easily, thus allowing electrons to flow through the system. There are four types of carrier: flavoproteins (e.g. FAD), cytochromes, iron-sulphur proteins (e.g. ferredoxin), and ubiquinone.
Are both zinc and iron transported in the blood by a fat carrier?
No. Its by a protein carrier.
