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Diffusion is not a substance. It is a physical process. Diffusion is the process where there is a movement of molecules from where they are abundant to where they are scarce. A more technical definition would be: Diffusion is a process in which molecules move from a region of higher concentration to a region of lower concentration.
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What are the simple sugars made up of?
Simple sugars are made up of monosaccharide molecules, which are the most basic units of carbohydrates. Monosaccharides consist of a single sugar molecule that cannot be broken down into smaller units by hydrolysis. Examples of monosaccharides include glucose, fructose, and galactose.
What are All gas exchanges are made by?
In animals, gas exchanges are primarily made by diffusion across respiratory surfaces such as the lungs or gills. This is where oxygen enters the bloodstream and carbon dioxide exits. In plants, gas exchange primarily occurs through small openings called stomata on the leaves.
What substance has large molecules of smaller units?
Polymers are substances that have large molecules made up of repeating units called monomers. Examples include plastics, DNA, proteins, and carbohydrates.
How do ligand-gated channels facilitate the process of facilitated diffusion?
Ligand-gated channels are proteins that open in response to specific molecules, called ligands, binding to them. When these channels open, they allow certain ions or molecules to pass through the cell membrane, facilitating the process of facilitated diffusion. This means that the movement of these ions or molecules across the membrane is made easier and faster, helping maintain the balance of substances inside and outside the cell.
Why can small hydrophobic molecules cross the membrane?
Small hydrophobic molecules can cross the cell membrane easily because the membrane is made up of a lipid bilayer that repels water but allows non-polar molecules, like hydrophobic ones, to pass through.
