Maharashtra BoardEnglish MediumSTD 11 ScienceBiologyBiomolecules3 Marks
Question
Write a note on properties of protein.
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Answer
Properties of proteins are as follows:
Proteins are extremely reactive and highly specific in behaviour.
Proteins are amphoteric in nature i.e. they act as both acids and bases.
The behaviour of proteins is strongly influenced by pH.
Like amino acids, proteins are dipolar ions at the isoelectric point i.e. the sum of the positive charges is equal to the sum of the negative charges and the net charge is zero.
The ionic groups of a protein are contributed by the side chains of the polyfunctional amino acids.
A protein consists of more basic amino acids such as lysine and arginine exist as a cation at the physiological pH of 7.4. Such proteins are called basic proteins.
Histones of nucleoproteins are basic proteins.
A protein rich in acidic amino acids exists as an anion at the physiological pH. Such proteins are called acidic proteins.
Most of the blood proteins are acidic proteins.
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