2. What processes created organic molecules before life arose? In what environments? 3. Why do proteins have enzymatic activities, but generally not polysaccharides or nucleic acids? 4. Carbon atoms are in their most reduced form in which type of organic molecules – carbohydrates, lipids, proteins or nucleic acids? 5.
In non-aqueous systems, the polar group is known as the oleophobic group and the non-polar group as oleophilic. Surfactants are classified according to their chemical structure and, more specifically, their polar group: anionic, cationic, electroneutral and non-ionic (see figure 1).