Multiple choice

Match the entries in Group-I (essential amino acids) with those in Group-II (corresponding functional groups/side chains) ||| |---|---| |Group-I |Group-II| |P. Histidine|1. hydroxy| |Q. Leucine|2. isobytyl| |R. Threonine|3. imidazole| |S. Tryptophan|4. indole|

  1. P - 3, Q - 2, R - 1, S - 4

  2. P - 3, Q - 4, R - 1, S - 2

  3. P - 3, Q - 4, R - 2, S - 1

  4. P - 1, Q - 2, R - 3, S - 4

  5. P - 2, Q - 1, R - 3, S - 4
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A Correct answer
Explanation

Histidine is an alpha amino acid, the conjugate acid of the imidazole side chain. Leucine is a branched-chain α-amino acid with the chemical formula HO2CCH(NH2)CH2CH(CH3)2. Because of the presence of aliphatic isobutyl side chain, Leucine is hydrophobic in nature. Threonine is an α-amino acid with the chemical formula HO2CCH(NH2)CH(OH)CH3. This essential amino acid is classified as polar. Together with serine, threonine is one of two proteinogenic amino acids bearing an alcohol group (-OH group). Tryptophan is one of the 22 standard amino acids and is an essential amino acid in the human diet. It has indole as fuctional group. Hence, the correct match of codes is P - 3, Q - 5, R - 1, S - 4.

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