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Which substance may enter a cell membrane by simple diffusion?
Biancaaex3
Water, certain ions, air and glucose molecules.
Wiki User
∙ 14y ago
Wiki User
∙ 9y agoOnly non-polar, small molecules can pass through a membrane by simple diffusion. This would include gases such as oxygen and carbon dioxide.
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When a substance wants to enter the cell it binds to what?
When a substance wants to enter a cell it goes through the cell membrane in a process called endocytosis.
What process do sugar molecules enter or exit a cell?
1. Sugar (sucrose) cannot penetrate the cells and cannot be absorbed in blood because this disaccharide molecule is too big. 2. After the degradation of the disaccharide to monosaccharides (fructose, glucose, etc.) with the help of the enzyme sucrase these monosaccharides are easily absorbed in blood. 3. The monosaccharides molecules can penetrate by diffusion.
Oxygen and carbon dioxide are exchanged in lungs and through all cell membranes by?
Gas exchanges occur by simple diffusion through the respiratory membrane -- oxygen passing from the alveolar air into the capillary blood and carbon dioxide leaving the blood to enter the gas-filled aveoli.
Cell membranes usually allow what substances to enter a cell?
the cell membrane allows what substance to enter the cells.
How does the plasma membrane maintain homeostasis?
The Plasma membrane maintains the homeostasis throughout a cell because it filters what substances go in and out of the cell. If there is too much of a substance in a cell the plasma membrane quickly disposes it and when there is not enough of a substance in a cell the plasma membrane lets the substance in.The plasma membrane uses selective permeability to maintain homeostasis in a cell by eliminating wastes and taking in needed items.
Identify at least five ways by which a substance may enter the cell?
Osmosis, diffusion, facilitated diffusion, active transport, passive transport.
How are diffusion and facilitated diffusion similar?
Substances enter a cell through the cell membrane
How does gases enter and leave capillaries?
Simple diffusion.
What substances would most likely require a protein to facilitate its diffusion across a cell membrane?
Quick answer: glucose Explanation: Any substance that the membrane selects against requires integral proteins to cross the membrane. B/c the lipid bilayer is selectively permeable, not all substances can pass through it by diffusion or osmosis. However, when the cell requires a substance that it's membrane does not easily allow to pass through, it must enter via the proteins in the membrane. They can either be carrier proteins or protein channels depending on the substance. One example of a substance which requires facilitated diffusion is glucose.
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.
Which substance can enter a cell by diffusion without have to be digested?
water
What substance crosses the cell membrane by simple diffusion?
Some substances, such as fructose molecules, need a little assistance to enter and exit cells.Proteins imbedded in the cell membrane lightly bind to these substances and then change shape to allow the substance to move across the cell membrane.This process is called facilitated diffusion.In facilitated diffusion, substances are moved from an area of high concentration to an area of lower concentration.
Where within the body does pressure affect diffusion of a substance?
Pressure increases the rate of diffusion. As the pressure on the membrane increase, attempts to enter the lower concentration increase, speeding the diffusion rate.
How does the second law of thermodynamic help to explain the diffusion of a substance across a membrane?
First, open up the Internet tab. THEN, go to Google. Last, type in your question and hit Enter. you are good to go after that! :)
When a substance wants to enter the cell it binds to what?
When a substance wants to enter a cell it goes through the cell membrane in a process called endocytosis.
What process do sugar molecules enter or exit a cell?
1. Sugar (sucrose) cannot penetrate the cells and cannot be absorbed in blood because this disaccharide molecule is too big. 2. After the degradation of the disaccharide to monosaccharides (fructose, glucose, etc.) with the help of the enzyme sucrase these monosaccharides are easily absorbed in blood. 3. The monosaccharides molecules can penetrate by diffusion.
Does sugar diffuse through the cell membrane?
No. Only non-polar, small molecules can pass through a membrane by simple diffusion. A sucrose molecule is too large a molecule to pass through a membrane by simple diffusion, however, it can pass through a plasma membrane (but not any artificial membranes like Visking tubings) by facilitated diffusion, i.e. through transport proteins(specific carriers for sucrose) embedded in the membranes. ! =)
