Question

Which classification of amino acids applies to the Trp residues after photochemical modification by CCl₃CO₃H? A.Acidic B.Basic C.Hydrophobic D.Polar neutral

Answer 1

Trp (tryptophan) is originally classified as a hydrophobic amino acid. After photochemical modification with CCl₃CO₃H, the classification might change if the modification adds a charged or polar group, but specific details of the modification would be needed to determine the new classification.

Step-by-step explanation:

The classification of amino acids, such as Trp (tryptophan) residues, after photochemical modification by CCl₃CO₃H, is based on the chemical nature of their side chain. In this case, Trp is originally classified as a hydrophobic amino acid due to its nonpolar side chain. However, after photochemical modification with CCl₃CO₃H, depending on the specific chemical changes, it could potentially alter the properties of Trp. If modification leads to the addition of a charged or a polar group, the classification might change. Without specific information on the chemical structure after modification, it is not possible to confidently answer which classification applies to the modified Trp residues.

Answer 2

The Trp (tryptophan) residues after photochemical modification by CCl3CO3H remain classified as hydrophobic due to the nonpolar characteristics of their side chain that does not ionize or carry a charge.

Step-by-step explanation:

The classification of amino acids after photochemical modification by CCl3CO3H that applies to the Trp (tryptophan) residues would be hydrophobic. This is based on the chemical nature of the side chain of the amino acid before modification. Tryptophan is known for its nonpolar, hydrophobic side chain, which is not charged and does not ionize. While chemical modifications can alter amino acids, the underlying hydrophobic character of the Trp residues is still a defining feature unless the specific modification adds a charged group, which is not indicated in the question. Therefore, the Trp residues after photochemical modification with CCl3CO3H should still be classified as hydrophobic.