No, they are not. Micelles are formed by amphipathic molecules, that is molecules having both poplar and nonpolar regions, such as phospholipids or fatty acids. The polar region stays to the outside of the sphere as it can interact with water or some other polar solvent and the nonpolar regions are forced to the center.
Yes, nonpolar molecules can cross the lipid bilayer because the lipid bilayer is made up of nonpolar molecules itself, allowing nonpolar molecules to pass through easily.
Yes, polar molecules can pass through the phospholipid bilayer through facilitated diffusion or active transport.
Yes, hydrophobic molecules can cross cell membranes because cell membranes are made up of a phospholipid bilayer that is permeable to nonpolar molecules like hydrophobic ones.
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Nonpolar Fatty acid chains
Yes, nonpolar molecules can cross the lipid bilayer because the lipid bilayer is made up of nonpolar molecules itself, allowing nonpolar molecules to pass through easily.
The diffusion of small nonpolar molecules through the phospholipid bilayer is known as simple diffusion. This process occurs as these molecules, such as oxygen and carbon dioxide, pass directly through the lipid bilayer without the need for transport proteins. Due to their small size and nonpolar nature, they can easily navigate through the hydrophobic core of the membrane, moving from areas of higher concentration to areas of lower concentration. This passive transport does not require energy input from the cell.
Yes, polar molecules can pass through the phospholipid bilayer through facilitated diffusion or active transport.
Yes, oxygen molecules are small and nonpolar, allowing them to pass directly through the phospholipid bilayer of cells by simple diffusion. This is one of the reasons why oxygen can easily enter and exit cells to support cellular respiration.
Yes, hydrophobic molecules can cross cell membranes because cell membranes are made up of a phospholipid bilayer that is permeable to nonpolar molecules like hydrophobic ones.
hydrogen bonds with the polar end of the phospholipid molecule
The phospholipid bilayer is the outer layer of the cell. It only lets very small molecules through it. The bigger ones will have to go through the proteins lodged in the bilayer and the HUGE molecules will have to perform exocytosis or endocytosis
Phosphate molecules.
Integral proteins are able to stay in the phospholipid bilayer because of the way they fold. Proteins have both hydrophic and hydrophilic regions that correspond to the regions of the phospholipid bilayer.
Side-by-side
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The cell membrane is a phospholipid bilayer, consisting of two layers of phospholipid molecules. Each phospholipid molecule has a hydrophilic (water-attracting) head and hydrophobic (water-repelling) tails, creating a barrier that controls the movement of molecules in and out of the cell.