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Chapter 6: Problem 141

Each question in this section has four suggested answers of which ONE OR MORE answers will be correct. The correct statement (s) among the following is/are (a) The amino acid tyrosine gives violet colour with neutral ferric chloride solution (b) Lysine is a basic amino acid (c) Serine is an amino acid containing sulphur (d) A tetrapeptide contains four peptide bonds

Short Answer

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a) The amino acid tyrosine gives violet color with neutral ferric chloride solution b) Lysine is a basic amino acid c) Serine is an amino acid containing sulfur d) A tetrapeptide contains four peptide bonds Answer: a) The amino acid tyrosine gives violet color with neutral ferric chloride solution, b) Lysine is a basic amino acid

Step by step solution

01

(a) The amino acid tyrosine gives violet color with neutral ferric chloride solution

For a statement to be true, tyrosine should react with neutral ferric chloride solution and produce a violet color. This is indeed a known property of tyrosine, as it contains a phenol group which can coordinate with iron in the ferric state (Fe^3+) to produce a violet color complex. Thus, statement (a) is correct.
02

(b) Lysine is a basic amino acid

To determine whether lysine is a basic amino acid, we need to examine its structure and properties. Lysine has a positively charged amino group (-NH3+) at its side chain, and this property makes lysine a basic amino acid. Thus, statement (b) is correct.
03

(c) Serine is an amino acid containing sulfur

To verify if serine contains sulfur, we need to examine its structure. Serine contains a hydroxyl (-OH) group in its side chain, not a sulfur-containing group. Therefore, statement (c) is incorrect.
04

(d) A tetrapeptide contains four peptide bonds

A tetrapeptide is a peptide molecule that consists of four amino acid residues linked through peptide bonds. Since there are always (n-1) peptide bonds for a peptide containing n amino acid residues, a tetrapeptide has (4-1) = 3 peptide bonds. Therefore, statement (d) is incorrect. #Conclusion# Among the four statements, (a) and (b) are correct: (a) The amino acid tyrosine gives violet color with neutral ferric chloride solution (b) Lysine is a basic amino acid

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