large or polar molecules
such as proteins, glucose or ions like Na+/K+
Water is the molecule that will move easily across the cell membrane. It can cross the membrane through special channels called aquaporins. Large proteins, starch, and DNA are too large to pass through the membrane without assistance.
Oxygen can diffuse across a cell membrane because it is a small, non-polar molecule that can easily pass through the lipid bilayer of the membrane. In contrast, proteins are large and often polar or charged, making it difficult for them to traverse the hydrophobic core of the lipid bilayer without assistance. Proteins typically require specific transport mechanisms, such as channels or carriers, to facilitate their movement across the membrane.
Oxygen can diffuse across a cell membrane because it is a small, nonpolar molecule that can easily pass through the lipid bilayer of the membrane. In contrast, protons (H⁺ ions) are charged and polar, making it difficult for them to traverse the hydrophobic core of the membrane without assistance. Protons typically require specific transport proteins, such as ion channels or pumps, to facilitate their movement across the membrane. This difference in size and polarity explains why oxygen can diffuse freely while protons cannot.
Water molecules freely diffuse across a semipermeable membrane.
Oxygen can diffuse across the cell membrane because it is a small, nonpolar molecule, allowing it to pass through the lipid bilayer easily due to the hydrophobic nature of the membrane. In contrast, proteins are larger and polar or charged, which prevents them from readily crossing the lipid bilayer without assistance. Instead, proteins typically require specific transport mechanisms, such as channels or carriers, to facilitate their movement across the membrane. This difference in size and polarity is key to the distinct transport processes for oxygen and proteins.
Water is the molecule that will move easily across the cell membrane. It can cross the membrane through special channels called aquaporins. Large proteins, starch, and DNA are too large to pass through the membrane without assistance.
Oxygen can diffuse across a cell membrane because it is a small, non-polar molecule that can easily pass through the lipid bilayer of the membrane. In contrast, proteins are large and often polar or charged, making it difficult for them to traverse the hydrophobic core of the lipid bilayer without assistance. Proteins typically require specific transport mechanisms, such as channels or carriers, to facilitate their movement across the membrane.
Movement of water across a membrane is called OSMOSIS.
Ions can't diffuse across membranes, they must used channels to transport across
The equilibrium of solute across a membrane is reached when the concentration of the solute is the same on both sides of the membrane. This means that the movement of the solute molecules is balanced, with an equal number of molecules moving in and out of the membrane. At equilibrium, there is no net movement of solute across the membrane.
quelle problem a driss
A carrier protein helps transport molecules across a cell membrane by binding to specific molecules and changing shape to move them across the membrane.
a voltage or electrical charge across the plasma membrane
Small particles move faster across the membrane.
When will water stop moving across a membrane when the water concentration is equal on both sides.
Water molecules freely diffuse across a semipermeable membrane.
Oxygen can diffuse across the cell membrane because it is a small, nonpolar molecule, allowing it to pass through the lipid bilayer easily due to the hydrophobic nature of the membrane. In contrast, proteins are larger and polar or charged, which prevents them from readily crossing the lipid bilayer without assistance. Instead, proteins typically require specific transport mechanisms, such as channels or carriers, to facilitate their movement across the membrane. This difference in size and polarity is key to the distinct transport processes for oxygen and proteins.