Respuesta :
Any molecule that is small enough to fit through can pass through the cell membrane. Other larger cells must pass through specialized protein channels that allow only specific molecules through.
The molecules diffuse through the cell membrane without using a channel protein are as follows:
- Gases (such as O₂ and CO₂), hydrophobic molecules (such as benzene), and small polar but uncharged molecules (such as H₂O and ethanol) are able to diffuse across the plasma membrane.
- Other biological molecules, however, are unable to dissolve in the hydrophobic interior of the phospholipid bilayer.
- Ions such as [tex]Na^+, K^+, Cl^-[/tex] can't get through due to their charge.
- Molecules such as glucose, sucrose, proteins, and starch cannot diffuse through cell membrane due to their large size.
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