1 answer

“Amino acids used in making a polypeptide have an amino group and carboxyl group, and these...

Question:

“Amino acids used in making a polypeptide have an amino group and carboxyl group, and these groups can be present on any carbon atoms.” Is that a correct statement? Why so? What is the basis for classification of amino acids to non-polar (but not aromatic), polar, and two oppositely charged (at physiological pH) amino acids? Provide examples with their exact name, three letter and single letter codes.


Answers

No, because the carboxyl group and amino group present on the alpha carbon only the it's help to make polypeptide chain.

Formation -co-nh​2- peptide bonds.

Functional groups which have pure hydrocarbon alkyl group and aromatic group are generally non polar. Example valine(Val)V, leucine(Leu) L etc

Polar amino acids are those which are interested to dissolve in aqueous water due to hydroxyl group, carboxyl group ammonia group.Eg: serine(Ser)S, threonine(Thr)T

Histidine opposite charge at physiological ph.(His)H

.

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