Answer:
the amino acid represented by the given structure is lysine (D).
Step-by-step explanation:
Let's review the concepts:
- Glutamic acid is an amino acid, HOOCCH2CH2CH(NH2)COOH, obtained by hydrolysis from wheat gluten and sugar-beet residues, used commercially chiefly in the form of its sodium salt to intensify the flavor of meat or other food.
- Glutamine is a crystalline amino acid, HOOCCH(NH2)CH2CH2CONH2, related to glutamic acid.
- Aspartic acid is a nonessential amino acid, C4H7NO4, produced by the hydrolysis of asparagine and proteins, found chiefly in young sugar cane and sugar-beet molasses, and used in the preparation of culture media and as a dietary supplement.
- Lysine is a crystalline, basic, amino acid, H2N(CH2)4CH(NH2)COOH, produced chiefly from many proteins by hydrolysis, essential in the nutrition of humans and animals.
- Asparagine, is a white, crystalline, amino acid, NH2COCH2CH(NH2)COOH), soluble in water, obtained from certain plaints, especially legumes, and used chiefly as am nutrient in culture media for certain bacteria.
The given amino acid has two positively charged amino groups (-NH3+) and one negatively charged carboxyl group (-COO-) at neutral pH, which makes it a basic amino acid. Looking at the structure, we see that it has a chain of five carbon atoms with the amino groups at the beginning and end of the chain. This means that the side chain is a straight chain alkyl group, which is characteristic of the amino acid lysine (Lys, K).