Which of the following is not an amino acid?
Correct answer: B. Lactic acid
- A. Histidine
- B. Lactic acid
- C. Alanine
- D. Glycine
Explanation
The correct answer is lactic acid. Lactic acid is not an amino acid; it is an organic compound that plays a role in various metabolic processes, primarily in the production of energy through anaerobic respiration. In contrast, histidine, alanine, and glycine are all amino acids that are components of proteins. Serine is essential for brain functions, alanine is involved in metabolic functions, and glycine contributes to protein structure and synthesis.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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