Which of the following is an essential amino acid?
- A$CH_3-CH(NH_2)-COOH$ (Alanine)
- B$HOCH_2-CH(NH_2)-COOH$ (Serine)
- C$(CH_3)_2CH-CH_2-CH(NH_2)-COOH$ (Leucine)
- D$HSCH_2-CH(NH_2)-COOH$ (Cysteine)
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Which of the following statements correctly describes the migration aptitude of aspartic acid during electrophoresis?
$(pK_1 = 2.0, pK_2 = 3.90, pK_3 = 10.0)$
$HOOC-CH_2-CH(NH_2)-COOH$
$(pK_1 = 2.0, pK_2 = 3.90, pK_3 = 10.0)$
$HOOC-CH_2-CH(NH_2)-COOH$
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