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.
Peptones are the parts of a PEA agar that supplies nitrogen. PEA stands for phenylethyl alcohol. A PEA agar is a substance that scientists use to grow bacteria so they can examine it. Peptones are the parts of a PEA agar that supplies nitrogen. PEA stands for phenylethyl alcohol. A PEA agar is a substance that scientists use to grow bacteria so they can examine it.