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What is osmosis and facilitated diffusion?
Diffusion is the net movement of particles(atoms,ions or molecules) from a region where are of higher concentration to a region where they are of lower concentration, down a concentration gradient.Factors that affect the rate of diffusion1.Temperature2.the concentration gradient3.Physical movement4 surface area to volume ratioThe passage of water from the less concentrated solution to the more concentrated solution across a partially permeable membrane is a process called osmosis
Is glucose the same as osmosis?
No, glucose is a substance, osmosis is a process. Glucose is a simple sugar and is made by photosynthesis in plant cells. Osmosis is the flow of water through a semi-permeable membrane from a region where there is a higher concentration of water to where there is a lower concentration of water. Osmosis happens in plant cells because the cell membrane is semi-permeable. The direction of water flow depends on how much glucose is dissolved in the cell sap compared to how much is in the liquid surrounding the cells. Thus glucose is involved in the process of photosynthesis.
Why did the starch not enter the beaker?
The starch did not enter the beaker because the membrane of the dialysis tubing is selectively permeable, allowing only smaller molecules, like glucose and water, to pass through. Starch molecules are too large to pass through the pores of the membrane, thus they were unable to enter the beaker.
Was the membrane-tubing-permeable to starch?
I'm assuming this is in reference to an experiment where you put a starch in dialysis tubing, and then put iodine in surrounding solution. Dialysis tubing has a limit of roughly mwco (molecular weight cut off of 10,000). Iodine has a molecular weight of roughly 126, so it can pass through. On the other hand, starch is a polymer of 1000's of glucose molecules. Glucose (C6H12O6) has a molecular weight of roughly 180. 1000 * 180 = 180,000, so glucose cannot pass through the dialysis tubing. In this experiment you should see the sealed tubing turn purple-pinkish after the iodine diffuses through. The outside solution should remain the same color.
Why oxygen molecules do not across a cell membrane while glucose molecules do not?
Glucose is too big to pass throught.
Is the Visking tubing a partailly permeable membrane and why?
Yes, it is a partially permeable membrane. It allows certain substances like glucose and water molecules to diffuse through but not large molecules like starch and sucrose. Selectively permeable.
What substances in the blood pass through the partially permeable membrane into the kidneys?
As the dialysis fluid has no urea in it, there is a large concentration gradient - meaning that urea moves across the partially permeable membrane, from the blood to the dialysis fluid, by diffusion. This is very important as it is essential that urea is removed from the patients' blood.
If a beaker contains glucose and is permeable to glucose what will happen to the glucose?
If a beaker containing glucose is permeable to glucose, then the glucose will go through the beaker.
What is the membrane called if other substances besides water oxygen carbon dioxide and glucose are blocked from entering?
The membrane is selectively permeable if it only allows certain substances like water, oxygen, carbon dioxide, and glucose to pass through while blocking others based on size, charge, or other properties.
What other uses of the cell membrane?
The cell membrane is partially permeable, to allow nutrients like glucose and oxygen to enter the cell, and for waste products (eg. CO2 and urea) to exit the cell. It does not hold the cell together; this is carried out in plant cells by a cellulose cells wall.
What substance not permeable at the cell membrane?
Large polar molecules like glucose and ions such as sodium and potassium are not permeable through the cell membrane. These molecules require specific transport proteins or channels to facilitate their movement across the membrane.
What organelle is part of selectively permeable?
It is based on the structure of the cell membrane, which has proteins and lipids in it that make some substances impermeable to the membrane, often based on slight electrical charges and sometimes by size of the molecule or other chemical properties. Some substances require an enzyme or hormone to cross the barrier of the cell membrane, such as binding sites on cell membranes that will not allow glucose into the cell unless insulin binds with the sites, which forms a chemical bridge to allow glucose molecules to pass through the cell membrane into the cell. Without the insulin, the cell membrane is impermeable to glucose.
what does semi-permeable mean?
It means it has a cell wall.
Is glucose permeable or impermeable?
Glucose is permeable, meaning it can pass through cell membranes.
How does concentration of amylase affect starch digestion?
Starch is a complex carbohydrate or polysaccharide, which consists of many monosaccharide molecules (glucose) joined together.Since the cell in the body has partially permeable membrane, it cannot absorb big size molecules, such as starch and protein.Hence, starch needs to be broken down to glucose before it can be absorbed into the cells of the body.
A model cell half full of an aqueous solution of glucose with a membrane that is permeable to glucose is placed into a beaker of distilled water Explain what is likely to happen?
do you go to UTAS? that is not an answer how is this going to help people ????
The cell membrane of red blood cells will allow water oxygen carbon dioxide and glucose to pass through. Because other substances are blocked from entering this membrane is called?
semi-permeable
