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Subject - Chemistry:

Basics

MCQ - 578-2764

Question:

Absorbance at 280nm exhibited by protein is due to

  1. aliphatic amino acids
  2. all amino acids
  3. non-polar amino acids
  4. all amino acids

Correct Answer: C

Explanation:

Aromatic amino acids are relatively nonpolar. To different degrees, all aromatic amino acids absorb ultraviolet light. Tyrosine and tryptophan absorb more than do phenylalanine; tryptophan is responsible for most of the absorbance of ultraviolet light (ca. 280 nm) by proteins

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