A) All amino acids have a common isoelectric point
B) All naturally occurring a-amino acids are optically active except glycine
C) At pH = 0 all amino acids are present as their anions
D) In strongly basic solutions, all amino acids are present as their cations
Correct Answer: B
Solution :
With the exception of glycine, all common naturally occurring a-amino acids have an asymmetric carbon atom and thus, are optically active. They bear a positive charge (exist as cations) in acidic solution (ie, at low pH) and a negative charge (exist as anions) in basic solution (ie, at high pH). At isoelectric point, amino acids carry no net charge. This is different for different amino acids.You need to login to perform this action.
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