Question

All amino acids in proteins are Select one: O a. alpha-amino acid O b. (R)-amino acids c. acidic O d chiral

Answer 1

Proteins are made from the structural units called Amino Acids. Amino acids contain Amine and carboxylic acid functional group. * Almost all 8f the amino acids in Proteins are X-Calpha) amino acids with (S)-absolute configu -ration, except in case of L-cysteine, which has (R)-Configuration : *. Almost all aminoacids in proteins are a-amino acids. O Carboxylic acid But not all with Lu tid -oh (5)-absolute configuration 2 of- 1... R - A side chain rac-Aminoacid structure]

* And most naturaky occuring amino acids are “CHIRAL" but Glycine is non-chiral. HN-CH=COOH . (Glycine) & In aminoacids Nita is basic; -coot is acidic. when these two are equal in number. It is Heutral But in some amino acids -coot a more in number than -NH2 groups, these are acidic. In another type -NH2 groups are more in number than con which are basic in nature. amino acids -coot groups are ember than -cool group.

* X-carbon in all aminoacids is chiral. Which means it connected with 4-different groups. But in Glycine L-Carbon is non-chirala н ANCA cool (Glycine) 4 groups are not different on R- Carbon, so it is non-chirale Eg: Alanine: HN-CH-cool 7 Neutral Aspartic acid: HN-at-c00l - ct cook} l Acidic Lysine: HN-CH-Coot ? Basic. (CH2) NH

crino From all the above, AN amino acids in Proteins (Naturally occuring are vola) alpha-amino acid,

Answer 2

Alpha amino acids