B) +1 to 0 and 0 to -1 C) 0 to-1 and -1 to -2 D) +2 to+1 and 0 to -1 E) +2 to +1

Question

B) +1 to 0 and 0 to -1 C) 0 to-1 and -1 to -2 D) +2 to+1 and 0 to -1 E) +2 to +1 and -1 to -2 18 - Which of the following amino acids has the highest isoelectric point? OH NH2 H3C B) A) NH2 C) H2N D) NH2 E) 19-Which of the following options apply to a zwitterion? A) Has no charged functional groups B) Has an overall positive charge C) Has an overall negative charge D) Would be present at the isoelectric point E) Only has an ionized side chain 20- A peptide bond is formed from... A) The alpha amino and alpha carboxylic B) The alpha amino and side chain hydroxyl C) The alpha amino and alpha amino D) The alpha carboxylic acid and alpha carboxylic acid E) The side chain amino and alpha carboxylic acid

Explanation / Answer

A) it has highest isoelectric point, because it is similar to histidine basic amino acid having additional amine group. Other options contains mier carboxylic group, which decrease the pl.

D) zwitterions has net charge zero, so prezent at isoelectric point.

A) peptide bond is form between alpha amino group of one amino acid to alpha carboxylic group of other amino acid.

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