Ions, glucose, and amino acids
Hydrophobic molecules or small molecules.
O2 H2o
A process known as passive transport helps molecules to diffuse across a membrane. Passive transport does not involve the use of chemical energy, unlike active transport does.
proteins
oxygen, carbon dioxide, and water molecules
Osmosis, Passive Transport, and Active Transport
passive transport by diffusion
Passive transport is the movement of molecules through cell membranes with out the use of energy by the cell
Osmosis, Passive Transport, and Active Transport
A process known as passive transport helps molecules to diffuse across a membrane. Passive transport does not involve the use of chemical energy, unlike active transport does.
Transport proteins and carrier proteins
proteins
oxygen, carbon dioxide, and water molecules
Carrier proteins facilitate passive transport of molecules across a membrane by changing its shape, by using ATP, to allow a substance to pass through the membrane.
Active transport requires energy; passive transport does not.
Osmosis, Passive Transport, and Active Transport
In active transport the ATP is used to pump molecules up the concentration gradient. Transport of molecules occurs from a low concentration of solute to high concentration of solute and requires cellular energy. While passive transport involves carriers, channels, or direct diffusion through a membrane.
passive transport by diffusion
Some examples of nutrients that require only passive transport through cells would be small molecules of glucose, oxygen, amino acids, carbon dioxide, and water.