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What is used as a channel to allow transport of molecules in and out of the nucleus?
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How do cells transport molecules across a cell membrane?
Molecules can move through the membrane in many ways. If the molecule is hydrophobic (or lipophilic) it can easily pass through the membrane. Other than that, most molecules move through the membrane through channels (which flow towards the molecules concentration gradient) or pumps (which flow against a molecules concentration gradient using energy).
What type of molecules need more help to get through the membrane and What is help them?
Large or polar molecules typically need more help to get through the membrane. They rely on specialized transport proteins such as channels or carriers to facilitate their passage. These transport proteins create pores or binding sites that allow the molecules to cross the membrane.
Which part of a cell allows nutrients and other materials to enter or leave the cell?
Transport proteins allow nutrients to enter and leave cells. Transport proteins are peppered throughout the cell membrane. Most molecules need the transport proteins to enter or leave the cell, but it's possible for some molecules, like water, to diffuse through the membrane by osmosis.
What property of the cell membrane enables it to perform active transport?
Embedded in the semi-permeable cell membrane are many different types of carrier proteins or channel proteins. These globular proteins allow the transport of specific substances from the outside of the cell into the cell or vice versa.Specific means each protein can only transport one type of substance across. For example, Protein A can transport Substance X but not Substance Y. Substance Y has to be transported by Protein B which cannot transport Substance X. The specific nature of these globular proteins mean it is easier for these molecules to be transported.
How does the structure of the membrane speed up or help speed up certain molecule transport without the use of energy?
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.
How and why are embedded transport proteins selective of the molecules they allow through the phospholipid membrane?
they are protein structures with very specific 3D configurations, thus only specific molecules with complementary shape can fit into the transport (carrier or channel) proteins. - Woon Yeow
Does active transport result in an even distribution of molecules?
No. Active transport uses energy to transport specific molecules against a concentration gradient. Passive transport will result in an even distribution of molecules because they allow molecules to move down a concentration gradient.
What are the passive transport?
Passive transport processes do not require ATP or energy for transport. Co-transport processes would also not be considered a passive process. -The xylem in plants uses capillary action, a passive process -If a specific channel exists for, let's say, an ion or molecule, then that channel uses passive transport, however, it the channel cannot be "gated" in any way as in voltage-gated Na+ channels or delayed rectifier K+ channels. You can also look at the ascending loop of Henle in the juxtamedullary nephron of the kidney and see passive transport of water molecules -The blood brain barrier also allows passive transport of certain molecules A good way to think of passive transport is whether or not the plasma membrane has "holes" big enough in it to allow for molecules to pass through, provided there are no charge hindrances for that molecule passing through. Or a specific channel is open and letting a molecule in without the expense of ATP (using ATP to make the membrane channel protein does not fall under this category)
What allows all molecules to pass through cell membrane?
Transport proteins allow charged molecules to pass through the cell membrane. The process of facilitated diffusion, a type of passive transport, allows transport proteins to take charges molecules into the cell.
What are Channel and carrier proteins?
Channel proteins are on the plasma membrane, selectively transport the solutes such as ions, small and large proteins across the membrane. Carrier proteins also membrane proteins that allow diffusion of different molecules. Both proteins are chemically made up of amino acids.
What does the cell wall help?
1) holds in the molecules that allow the cell to function (to be alive). 2) keeps out most foreign molecules. 3) "contains" transport molecules that move specific molecules in and out.
What does the cell wall help with?
1) holds in the molecules that allow the cell to function (to be alive). 2) keeps out most foreign molecules. 3) "contains" transport molecules that move specific molecules in and out.
How do carriers proteins facilitate passive transport of molecules across a membrane?
Carrier proteins facilitate passive transport of molecules across a membrane by changing its shape, by using ATP, to allow a substance to pass through the membrane.
What type of molecule embedded in the cell membrance allows larger molecule to pass through the membrance by active transport?
Transport proteins allow the active transport of large molecules through the cellular membrane.
What molecules are permeable to the cell membrane?
Hydrophobic molecules are permeable to the cell membrane. Anything that is samll and hydrophobic will pass easily. Larger, hydrophilic molecules require a transport protein to allow permeability.
Which part of the cell surrounds the cell and allows molecules in and?
The cell membrane is the thing that surrounds the cell. The cell membrane contains proteins that allow active transport of molecules in and out of the cell.
How do cells transport molecules across a cell membrane?
Molecules can move through the membrane in many ways. If the molecule is hydrophobic (or lipophilic) it can easily pass through the membrane. Other than that, most molecules move through the membrane through channels (which flow towards the molecules concentration gradient) or pumps (which flow against a molecules concentration gradient using energy).
