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.
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