Carboxyl groups have an electronegative oxygen atom double bonded to a carbon atom. This carbon-oxygen bond is very polar and the fact that its a double bond increases the polarity of the bond.
PEA agar, also referred to as Phenylethyl Alcohol Agar is a medium  used by microbiologists to grow microorganisms. The ingredient that  supplies nitrogen is casein. Making the world better, one answer at a time.
1 Pea protein contains purines, so people with gout should ask their healthcare provider before taking a supplement. 2  Processing peas into protein could lead to contamination by fertilizers, chemical solvents, and other ingredients. 3  Make sure you're buying a high-quality brand.