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.
Best Ever Split Pea - Ingredients. 1  Calories: 133 kcal 7%. 2  Fat: 2.1 g 3%. 3  Carbs: 18.4g 6%. 4  Protein: 11.2 g 22%. 5  Cholesterol: 0 mg 0%. 6  Sodium: 723 mg 29%.