Textbook QuestionExplain why the pI of lysine is the average of the pKa values of its two protonated amino groups.710views
Textbook Questiona. What percentage of the a-amino group of lysine will be protonated at its pI? <25% 50% >75% b. Answer the same question for the e-amino group of lysine608views
Textbook Questiona. Which amino acid has the lowest pI value? b. Which amino acid has the highest pI value?475views
Textbook Question(a) The isoelectric point (pI) of phenylalanine is pH 5.5. Draw the structure of the major form of phenylalanine at pH values of 1, 5.5, and 11.1342views
Textbook QuestionMost naturally occurring amino acids have chiral centers (the asymmetric α carbon atoms) that are named (S) by the Cahn–Ingold–Prelog convention (Section 5-3). The common naturally occurring form of cysteine has a chiral center that is named (R), however.(b) (S)-Alanine is an l-amino acid (Figure 24-2). Is (R)-cysteine a d-amino acid or an l-amino acid?259views
Textbook Questiond. Which amino acid has a greater negative charge at pH = 6.20, glycine or methionine?402views
Textbook QuestionExplain the order of elution (with a buffer of pH 4) of the following pairs of amino acids through a column packed with Dowex 50 (Figure 21.3): a. aspartate before serine420views
Textbook QuestionExplain the order of elution (with a buffer of pH 4) of the following pairs of amino acids through a column packed with Dowex 50 (Figure 21.3): b. serine before alanine446views
Textbook QuestionWhich has a higher percentage of negative charge at physiological pH (7.4), leucine with pI = 5.98 or asparagine with pI = 5.43?435views
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