Amino Acids - Free MCQ Practice Test with solutions, MCAT Biochemistry

H₃ N⁺ – CH( CH₂ COO^–) – COO^–
Glutamate: H₃ N⁺ – CH( C₂ H₄ COO^–) – COO^–.

Tryptophan and tyrosine are significantly more polar than phenylalanine because of the tyrosine hydroxyl group and the nitrogen of the tryptophan indole ring.

Phenylalanine is one of the 9 essential amino acids.

Isoleucine produces both glucose and ketone bodies as an energy source.

H₅ C₂ – C ̇H(CH₃)- C ̇H(NH₂) – COOH
The structure clearly shows two chiral centers of isoleucine.

Glycine: H₃ N⁺ – CH₂ – COO^–
Alanine: H₃ N⁺ – CH(CH₃) – COO^–
Leucine: H₃ N⁺ – CH(C₄ H₉) – COO^–.

pI = ¹⁄₂ (pK₁ + pK₂) = ¹⁄₂ (2.34 + 9.60) = 5.97.

Serine is one of the 11 non-essential amino acids.

Proline is secondary amino acid also called as an imino acid as it contains –C = NH – OH group.

In case of Glycogenic amino acids pyruvate metabolites are formed and in case of ketogenic amino acids acetoacyl CoA is formed during the catabolism.