Bio notes chap 7 The lipoid bilayer serves as barrier to any molecules that are not small and hydrophobic. Even single atoms that are tiny will not penetrate the lipid bilayer if they are changed (ions) Co2, 02, n2, steroid hormone and really among the only molecules that can freely move thus the bilayer. q) how can a cell exchange polar larger molecules with its environment? a) By placing channels, pores, carriers in the lipid bilayer. Most channels and carriers etc are made of proteins that are…
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