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The answer is that glucose crosses a semi-permiable membrane by the process of facilitated diffusion. It cannot be by osmosis, because osmosis is the moving of only water from a concentration of high to low.
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∙ 14y ago
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∙ 14y ago"Facilitated diffusion" is the process that allows glucose to pass through the cell membrane. As in osmosis, facilitated diffusion allows glucose to move from a higher to a lower concentration area, but the glucose molecules must be bound to specific "facilitator" molecules. It is a form of passive transport requiring no energy, but it does require "transmembrane proteins."
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∙ 14y agoAs glucose is a polar molecule, it cannot cross the membrane, it needs the help of transporter proteins. In the cell membrane this occurs via facilitated diffusion using transporter proteins. In the walla of the intestine and kidneys glucose is actively transported requiring ATP to operate.
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∙ 9y agoGlucose crosses the cell membrane by means of facilitated diffusion. This is driven by the concentration gradient of sugar along with insulin.
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∙ 12y agoGlucose provides energy that all your cellsrequire, but before they can use it, the glucose must pass
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∙ 14y agoSecondary active transport with the help of a sodium/glucose pump.
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∙ 14y agoFacilitated Diffusion
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∙ 11y agoFacilitated diffusion
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∙ 11y agoprotein y'all!!
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How easy or hard is it for polar molecules to pass through the cell membrane?
Polar molecules are effectively charged molecules. It's hard for them to cross the cell membrane because the membrane is comprised of an uncharged phospholipid bilayer. Charged molecules tend to have specific protein channels that allow them to cross the membrane.
How do molecules that are too large to cross the membrance enter into the cell?
If the large molecule won't pass through the membrane by diffusion, it might be dragged through the membrane by "endocytosis".
The plasma membrane is a semipermeable membrane. This means that it is?
it is permeable to some molecules and not permeable to others.
What is the name of the process when glucose enters cells?
Glucose can move into cells by active or passive transport, in both cases membrane-spanning proteins are required. Active transport (SGLT) uses the concentration gradient of Sodium ions to move glucose against its concentration gradient. Passive transporters (GLUT) are only effective if the concentration of glucose in the cell is lower than outside the cell.
What does faciliated diffusion mean?
It means that in order to cross a barrier, for example a cell membrane, a substance must have a facilitator substance to make it permeable to the barrier. For instance, glucose cannot enter cells unless insulin is present to facilitate the diffusion of glucose from blood to cell. Without the insulin, or with damaged insulin receptors on the cell membrane, the cell membrane remains impermeable to glucose and it cannot enter the cells, so it remains in the blood plasma. This is what causes diabetes.
How easy or hard is it for polar molecules to pass through the cell membrane?
Polar molecules are effectively charged molecules. It's hard for them to cross the cell membrane because the membrane is comprised of an uncharged phospholipid bilayer. Charged molecules tend to have specific protein channels that allow them to cross the membrane.
How membrane is selectively permeable?
means that the cell membrane has some control over what can cross it, so that only certain molecules either enter or leave the cell
How is the membrane permeability?
means that the cell membrane has some control over what can cross it, so that only certain molecules either enter or leave the cell
What does partially permeablele mean?
For a cell membrane, partial permeability means that only certain molecules can pass through like carbon dioxide and oxygen while other molecules such as glucose cannot.
How do molecules that are too large to cross the membrance enter into the cell?
If the large molecule won't pass through the membrane by diffusion, it might be dragged through the membrane by "endocytosis".
What does glucose molecules are the building blocks of carbohydrates mean?
It means carbohydrates are primarily made up of glucose molecules.
How many molecules of glucose are needed to make 300 molecules of ATP in aerobic respiration?
One molecule of glucose will produce 38 molecules of ATP. This means that 300/38 molecules of glucose are needed, or 8, which will make 304 ATP molecules.
Term used to describe a cell membrane means that the membrane contains different kind of molecules?
That kind of membrane in cells is called a mosaic membrane since the molecules are not all the same.
The plasma membrane is a semipermeable membrane. This means that it is?
it is permeable to some molecules and not permeable to others.
What is the name of the process when glucose enters cells?
Glucose can move into cells by active or passive transport, in both cases membrane-spanning proteins are required. Active transport (SGLT) uses the concentration gradient of Sodium ions to move glucose against its concentration gradient. Passive transporters (GLUT) are only effective if the concentration of glucose in the cell is lower than outside the cell.
Which requires the use of energy to move a molecule across a cell membrane?
No. Water molecules can osmotically cross the cell membrane because they are small enough that their polarity does not matter. Then there are porins. Channels across the cell membrane that water molecules use.
what does semi-permeable mean?
It means it has a cell wall.
