A common example of a semi-permeable membrane is the phospholipid bilayer[?] (plasma membrane) found in biological cells[?], and also around the mitochondrion inside biological cells. In this case the phospholipid bilayer will let molecules with a low molecular weight (relative molecular mass) through such as glucose (C6H12O6) and water (H20), but not larger and more important molecules such as proteins, dna, or carbohydrates which means that to transport protein or starch material would require them to be catalytically broken down into their monomer subunits.
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