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How can you tell if glucose starch water and iodine passes through the cell membrane?
If the glucose, starch, and iodine pass through the cell membrane, you can perform a color change test. The presence of glucose will show a positive result with Benedict's reagent turning orange/red. The presence of starch will show a positive result with iodine turning blue/black.
Which two factors of the molecule determine whether or not it can cross the membrane?
size and shape. cell membranes are selectively permeable, so only some molecules can get through. (i.e. water can go through, but starch cant) Polarity and size.
What is the effect of the saliva on starch?
It partially brakes down the starch in food to form simple sugars through the enzyme present in it.
What would happen if you added water to a starch molecule?
Adding water to a starch molecule would lead to the hydrolysis of the starch molecule into smaller subunits such as glucose. This process involves breaking the glycosidic bonds between the glucose units in starch through the addition of water molecules. Ultimately, this results in the breakdown of the starch molecule into simpler sugar components.
What two factors of a molecule determine whether or not cross the membrane?
size and shape. cell membranes are selectively permeable, so only some molecules can get through. (i.e. water can go through, but starch cant) Polarity and size.
Why don't starch molecules pass through partially permeable membranes?
Starch molecules are too large to pass through the pores of a partially permeable membrane. The size exclusion limit of the membrane restricts the passage of larger molecules like starch while allowing smaller molecules like water to pass through via osmosis.
When a mixture of starch and glucose is put into a bag made from partially permeable membrane and is put in a beaker so after 20 minutes what change will take place in the contents of bag?
After 20 minutes, the glucose molecules will diffuse out of the bag through the partially permeable membrane because they are smaller in size than the starch molecules. The starch molecules, being too large to pass through the membrane, will remain inside the bag.
If a membrane was not permeable to sugars why would it probably also not be permeable to starch molecules?
If a membrane is permeable to a substance, it means that there are gaps/holes/pores in the membrane large enough for that substance to pass through. Starch molecules are bigger that sugar molecules. So if the membrane is not permeable to sugars, the gaps/holes/pores will not be big enough for starch molecules to pass through either.
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.
How can you tell if glucose starch water and iodine passes through the cell membrane?
If the glucose, starch, and iodine pass through the cell membrane, you can perform a color change test. The presence of glucose will show a positive result with Benedict's reagent turning orange/red. The presence of starch will show a positive result with iodine turning blue/black.
Why is glucose allowed to pass through a semipermeable membrane and not starch?
Whether molecules are able to pass through the membrane depends on the size of the molecules. Smaller ones can, and larger ones cannot. Glucose can pass through a cell membrane because it is a monomer, which is a smaller molecule than the polymer molecules of starch.
Which two factors of the molecule determine whether or not it can cross the membrane?
size and shape. cell membranes are selectively permeable, so only some molecules can get through. (i.e. water can go through, but starch cant) Polarity and size.
What is the effect of the saliva on starch?
It partially brakes down the starch in food to form simple sugars through the enzyme present in it.
Is a plastic bag permeable to iodine or starch?
Iodine is permeable to a plastic bag because the starch's molecules are too large to pass through the bag (starch is a complex sugar made of a large chain of monosaccharides), while the Iodine can pass through since iodine is usually only two Iodine atoms (I2).
Which two factor determine whether or not it can cross the membraners of a molecule?
politary and speed
If the tubing was permeable to starch which way would the starch move into the tubing or out of the tubing?
Solutions tend to move from areas of high concentration to areas of low concentration. So if a bag is permeable to starch, the starch will rush into the bag.
What would happen if you added water to a starch molecule?
Adding water to a starch molecule would lead to the hydrolysis of the starch molecule into smaller subunits such as glucose. This process involves breaking the glycosidic bonds between the glucose units in starch through the addition of water molecules. Ultimately, this results in the breakdown of the starch molecule into simpler sugar components.
