This is a picture of oil and water. In this picture you could see that when mixed the two substances do not become homogenous. This is because oil is a hydrophobic substance, this means that it is made of large molecules that repel water. Cells have membranes that are made of phospholipids. One part is hydrophilic and one is hydrophobic, not all substances can enter the membrane because the hydrophobic part. Therefore protein channels are used to allow entry.
+8/5 - great connection, picture, and connection to cells!
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