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What membrane do pyruvic acid molecules pass through?
the inner/outer membranes of mitochondria
What is the name given to membranes that only allow certain materials to pass through them?
"semipermeable"
Why could glucose could pass through the visking tubing?
Because it has starch in it.
Can starch pass through visking tubing?
We supply Visking tubing and offer the following information: The molecular weight cut-off of this product is 12000 - 14000 daltons. This means in theory that molecules larger in MW than this will not pass through the membranes and ones smaller will. Starch has a very high molecular weight and the tubing is often used to illustrate the effect of enzymes breaking starch down into to simple sugars. Starch therefore should not pass through the membrane wall. The user of this product should be aware that this is a nominal cut-off and long thin molecules above the 14kd cut-off may go through and globular molecules below may be retained. In addition the charge on a molecule may effect the rate of transfer across the membrane.
Acetylcholine a quaternary ammonium compound can not penetrate membranes why?
Ach has a positive charge on the Nitrogen. This makes it harder for Ach to pass through lipophillic membranes which are nonpolar. Remember likes attract likes. Ach would prefer a polar environment like water.
Can glucose pass through a membrane?
Dialysis membranes are typically not permeable to sucrose. Removing sugar from the blood can be dangerous as it can lead to hypoglycemia. Sugar molecules are too large to pass through dialysis membranes.
What statement explains why oxygen molecules easily diffuse across a cell membrane which glucose molecules do not?
Glucose is too big to pass throught.
How does a cell solve the problem of glucose being to big to pass through the cell membrane?
Active uptake, which requires energy and protein carriers in the membranes.
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.
What are membranes that allow only certain substances to pass through them?
Semi permeable membranes.
What types of substances pass easily through living cell membranes?
oxygen and carbon dioxide
Can glucose pass through visking tube?
fine glucose molecules can pass through the wall of the visking tube.
What allows water to pass through?
water can pass through cell membranes by osmosis- similar to diffusion
What is it called when sugar passes through an animal cell?
glucose (sugar) can diffuse through cell membranes
Does a permeable membrane will let substances pass through it?
Yes it does permeable membranes are membranes that allows all substances to pass through.
How can polar molecules pass through cell membranes?
Through facilitated diffusion
What allows water molecules to pass through?
water can pass through cell membranes by osmosis- similar to diffusion
