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What is the difference between diffusion and facilitated diffusion in terms of the movement of molecules across a cell membrane?
Diffusion is the movement of molecules across a cell membrane from an area of high concentration to low concentration without the need for a protein. Facilitated diffusion also moves molecules from high to low concentration, but requires a specific protein to help them pass through the membrane.
What is the recommended composition of the post game meal of the athlete?
An athlete's post-game meal should definitely be high in protein. Protein helps muscles to be repaired that have been damaged by exercise.
Is facilitated diffusion?
Facilitated Diffusion is the movement of molecules across cell membranes through protein channels and carrier proteins.Facilitated diffusion is a passive transport process, aka no energy required, where substances move down their concentration gradient (high concentration to low concentration) across a protein through a membrane protein because it is unable to diffuse directly through the phospholipid portion of the membrane itself.Diffusion of molecules assisted by protein channels that pierce a cell membrane
What is the double layered membrane where ribosomes are present?
Rough endoplasmic reticulumn have ribosomes on it.It gives a high surface area for protein synthesis.
Which type of transporters is used to move a molecule from a region of low concentration traction to a region of high concentration?
protein molecules in the cell membrane
Why you use skim milk to block the membrane in western blotting?
The membrane binds proteins unspecifically (it will bind any).Western blotting uses antibodies to probe the proteins bound to the membrane for the one you are testing for. The antibodies bind specifically to a particular protein that you have chosen and contain a label to allow identification of them on the membrane. In this way you can see whether or not the membrane, and therefore the tissue you are testing, contains a particular protein.Antibodies are proteins. This means the antibody would bind anywhere on the membrane, as well as on the protein you're looking for, rendering the results worthless (it will ALWAYS show positive). To stop the antibodies binding to the membrane, so that they only bind to the protein (if it exists) the membrane must be blocked (completely filled with protein) so that there is nowhere on the membrane for the antibody to bind.Since milk contains a generic mix of a relatively high concentration of known proteins, it is used to block the parts of the membrane that don't already have protein on so that the antibodies won't bind there. As it is very cheap and readily available, it is a good source of protein to use. It is unlikely that a Western blot would be needed for any protein that is contained in milk, but if that is the case an alternative mixture can be used.
Are proteins found in the cell membrane?
There are many uses for proteins in a cell membrane but the most common ones are: 1. Facilitated diffusion- a protein acts almost like a channel to allow molecules that cannot fit across the phospholipid bilayer to diffuse into/out of the cell 2. Active transport- proteins are used to move particles across the membrane from low to high concentration, using energy. 3. As receptor molecules which take signals from things like hormones.
Does osmosis require protein?
Nope! Osmosis is simply the movement of H2O over a membrane from high concentration to low concentration. It's a form of passive diffusion!
How do water-soluble molecules diffuse through the cell membrane?
Water-soluble molecules diffuse through the cell membrane by passing through protein channels or transporters that are embedded in the membrane. These channels and transporters allow the molecules to move across the membrane, from an area of high concentration to an area of low concentration, without requiring energy.
How can E coli maintain a fluid cell membrane it at different temperature?
E. coli can maintain fluidity of its cell membrane at different temperatures by adjusting the composition of its membrane lipids. It can increase the proportion of unsaturated fatty acids in its membrane when exposed to low temperatures, which helps to keep the membrane fluid. Conversely, when exposed to high temperatures, E. coli can increase the proportion of saturated fatty acids to maintain membrane integrity.
When do cells do active transport?
When transporting substances from low to high concentration, or when transporting substances too large to pass through the membrane without assistance from a transport protein.
What is Nephrotic syndrome?
Nephrotic syndrome is a group of symptoms including protein in the urine (more than 3.5 grams per day), low blood protein levels, high cholesterol levels, high triglyceride levels, and swelling. Nephrotic syndrome is caused by various disorders that damage the kidneys, particularly the basement membrane of the glomerulus. This immediately causes abnormal excretion of protein in the urine.
