Small hydrophobic molecules make up (C). Tiny, nonpolar molecules, such as co2 and o2: The phospholipid bilayers act as a barrier, preventing these chemicals from passing thru lipid bilayer.
Since they may spread swiftly, they do not really require proteins for transportation.
Small hydrophobic molecules including gases, such as oxygen and carbon dioxide, quickly pass through membrane. Ethanol and water are examples of small particles that can move across membranes, although much more slowly. If the hydrophobic molecules are tiny sufficient, they may pass freely through the plasma membrane since the inside of membrane also despises moisture. Simple Diffusion Thru the Cell Membrane: The structure of the lipid bilayer enables tiny, unindicted chemicals like o2 and co2, as well as hydrophobic substances like lipid, to move throughout the cell surface via simple diffusion, down the concentration gradient.
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