Identify the most likely mode of transport across the membrane for substance . explain how information provided helps determine the most likely mode of transport.
Question: Identify the most likely mode of transport across the membrane for substance . explain how information provided helps determine the most likely mode of transport.
The most likely mode of transport across the membrane for glucose is facilitated diffusion.
Facilitated diffusion is a type of passive transport that involves the use of a transport protein to move molecules across the cell membrane. Transport proteins are specific for the molecules they transport, and they help to increase the rate of diffusion across the membrane.
Glucose is a polar molecule, which means that it has a hydrophilic (water-loving) head and a hydrophobic (water-hating) tail. This makes it difficult for glucose to diffuse across the cell membrane, which is made up of a lipid bilayer. However, there are transport proteins in the cell membrane that are specific for glucose. These transport proteins bind to glucose molecules and help them to diffuse across the membrane.
The information provided in the question that helps to determine the most likely mode of transport for glucose is that glucose is a polar molecule. Polar molecules cannot diffuse across the cell membrane on their own, so they must use a transport protein to cross the membrane. Facilitated diffusion is the only mode of transport that involves the use of transport proteins, so it is the most likely mode of transport for glucose.
Here are some other examples of molecules that are transported across the cell membrane by facilitated diffusion:
- Amino acids
- Water-soluble vitamins
- Ions
Facilitated diffusion is an important mode of transport for many molecules that are essential for cell function. It allows cells to take in and release molecules without having to expend energy.
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