In each of the following pairs of amino acids identify which

In each of the following pairs of amino acids, identify which amino acid would be most soluble in water: Ala, Leu Tyr, Phe Ser, His Trp, Ala

Solution

Which amino acid is most soluble in water: Ala or Leu?

Answer :Ala

Leu has more CHs , therefore more insoluble than Ala

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Which amino acid is most soluble in water: Tyr or Phe?

Answer :Tyr

tyrosine is hydrophobic

it is significantly more soluble that is phenylalanine.

The phenolic hydroxyl of tyrosine is significantly more acidic than are the aliphatic hydroxyls of either serine or threonine.

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Which amino acid is most soluble in water: lys or His?

Answer : Ser

Ser amino acid is most soluble in water: due to alcohol group

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Which amino acid is most soluble in water: Trp or Ala?

Answer : Tryptophan

Tryptophan: it is borderline hydrophobic/polar.

the proton attached to the indole nitrogen can act as a hydrogen bond donor to water or other hydrogen bond acceptors