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.
Pea protein contains all nine essential amino acids except for methionine. Animal proteins that are rich in essential amino acids include beef, pork, turkey, chicken, eggs, milk, yogurt, cheese, and seafood. Animal proteins are considered complete proteins because they contain all of the essential amino acids.