They are too large and usually contain hydrophilic regions which prevent movement across the hydrophobic core of the plasma membrane.
Polysaccharides are generally too large to passively diffuse through the cell membrane. Instead, they are broken down into smaller sugar molecules by enzymes outside the cell, which can then be transported across the membrane by specific transport proteins. Alternatively, some cells have mechanisms to engulf and internalize polysaccharides through endocytosis.
Polysaccharides are too large to pass through the plasma membrane by simple diffusion. Instead, they are typically transported into or out of the cell through facilitated diffusion or active transport processes using specific carrier proteins. This allows the cell to regulate the movement of polysaccharides based on its metabolic needs.
Proteins that are attached to the ribosomes, I suppose
They are too large to be transformed by carrier proteins. They are moved across by Vesicles instead.
Molecules that are charged or polar, such as ions, glucose, and amino acids, diffuse through cell membranes by facilitated diffusion. This process relies on carrier proteins or channel proteins to help facilitate the movement of these molecules across the membrane.
they are too big is the simple answer - water is a tiny molecule when compared to even the smallest protein
Proteins and polysaccharides are too large to pass through the hydrophobic lipid bilayer of the cell membrane. Water, being a small molecule, can easily pass through the membrane via simple diffusion. Proteins and polysaccharides typically require specialized transport mechanisms, such as channels or carrier proteins, to facilitate their movement across the membrane.
Polysaccharides are generally too large to passively diffuse through the cell membrane. Instead, they are broken down into smaller sugar molecules by enzymes outside the cell, which can then be transported across the membrane by specific transport proteins. Alternatively, some cells have mechanisms to engulf and internalize polysaccharides through endocytosis.
Polysaccharides are too large to pass through the plasma membrane by simple diffusion. Instead, they are typically transported into or out of the cell through facilitated diffusion or active transport processes using specific carrier proteins. This allows the cell to regulate the movement of polysaccharides based on its metabolic needs.
Transport proteins allow the active transport of large molecules through the cellular membrane.
Large molecules such as proteins and polysaccharides are usually too large to be transported by carrier proteins. These molecules are often transported through other mechanisms like endocytosis or exocytosis.
Proteins that are attached to the ribosomes, I suppose
Endocytosis.
They are too large to be transformed by carrier proteins. They are moved across by Vesicles instead.
Molecules that are charged or polar, such as ions, glucose, and amino acids, diffuse through cell membranes by facilitated diffusion. This process relies on carrier proteins or channel proteins to help facilitate the movement of these molecules across the membrane.
Water soluble molecules diffuse through biological membranes via facilitated diffusion, which involves the use of specific transport proteins embedded in the membrane. These proteins create channels or carriers that allow the molecules to pass through the hydrophobic interior of the membrane. This process is passive and does not require energy input from the cell.
Substances that are small, nonpolar, and uncharged will diffuse through a membrane easily. This includes gases like oxygen and carbon dioxide, as well as small lipophilic molecules. Larger or charged molecules may require assistance from transport proteins to cross the membrane.