Question

Which of the following are true of the 20 common amino acids? Pick ALL that apply.

	A.	They are polymers used to make proteins.
	B.	They are β-amino acids.
	C.	They all have the same carboxylic acid group.
	D.	They all have the same R-group.
	E.	They all have the same amino group.

Answer 1

Amino acids are organic compounds which contain both the amine group (-NH,) and the acid group (-COOH). Peptide bond: Peptide bond is a link between amino acid through the acid group ( -COOH) of one amino acid to the amine group (-NH,) of other amino acid. This peptide bond is shows as follows: Nonessential amino acids: These amino acids are also known as conditionally essential amino acids. A nonessential amino acid is that can be synthesized by the living organism means by biosynthesized. The following are nonessential amino acids with three letter and one letter abbreviations: -CO-NH- Peptide bond When the amino acids are linked by dehydration (loose of water) process to form peptide bonds protein is formed. 1. Alanine; Ala, A 2. Arginine, Arg,R 3. Asparagines, Asb,N 4. Aspartic acid, Asp, D 5. Cysteine, Cys,c 6. Glutamic acid, Glu, E 7. Glutamine, Gln, Q 8. Glycine; Gly, G 9. Proline, Pro, P 10. Serine, Ser, S 11. Tyrosine, Tyr, Y Essential amino acids: These amino acids are also known as indispensable amino acid. An essential amino acid is that cannot be synthesized by the living organism, means by biosynthesized. It must be supplied only by its diets. The following are essential amino acids with three letter and one letter abbreviations: The following are true of the 20 common amino acids A. They are polymers used to make proteins. 1. Histidine, His, H 2. Isoleucine, Ile, I 3. Leucine, Leu, L 4. Lysine, Lys,K 5. Methionine, Met, M 6. Phenylalanine, Phe, F 7. Threonine, Thr, T 8. Tryptophan, Trp, W 9. Valine; Val, V C. They all have the same carboxylic acid group, which is -COOH E. They all have the same amino group, which is -NH2