Which statement about aromatic amino acids is CORRECT?
A) All are strongly hydrophilic.
B) Histidine's ring structure results in its being categorized as aromatic or basic, depending on pH.
C) On a molar basis, tryptophan absorbs more ultraviolet light than tyrosine.
D) The major contribution to the characteristic absorption of light at 280 nm by proteins is the phenylalanine R group.
E) The presence of a ring structure in its R group determines whether or not an amino acid is aromatic.
Correct Answer:
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Q6: Of the 20 standard amino acids, only
Q7: Amino acids are ampholytes because they can
Q8: In a highly basic solution, pH =
Q9: An octapeptide composed of four repeating glycylalanyl
Q10: At the isoelectric pH of a tetrapeptide:
A)
Q12: The chirality of an amino acid
Q13: At pH 7.0, converting a glutamic
Q14: For amino acids with neutral R groups,
Q15: Which statement about cystine is CORRECT?
A) Cystine
Q16: The formation of a peptide bond between
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