What is the correct sequence of proteins to amino acids?
A. Proteins
B. Peptones
C. Simple peptides
D. Polypeptides
E. Amino acids
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → A, B, D, C, E
Proteins are long chains of amino acids joined by peptide bonds. On hydrolysis (by acid, alkali or enzymes) the peptide bonds break step by step, so each stage has a shorter chain than the one before it.
A. Proteins — first. The whole chain, the largest molecule of the series.
B. Peptones — second. The first large fragments formed when the protein chain is broken.
D. Polypeptides — third. Shorter chains made by further hydrolysis of peptones, still with many amino acid units.
C. Simple peptides — fourth. Only a few amino acid units (di-, tri-peptides), smaller than polypeptides.
E. Amino acids — last. The monomers left when every peptide bond is hydrolysed.
Note: The question is from beyond the NCERT textbook.