Understanding biomolecules is essential for competitive exams, and Peptide Formation and Amino Acids Chemistry MCQs with Answers play a crucial role in mastering this topic. Amino acids are the building blocks of proteins, and their behavior, reactions, and bonding patterns are frequently tested in exams like NEET, CUET, and JEE.

To begin with, Peptide Formation and Amino Acids Chemistry MCQs with Answers help aspirants understand how amino acids combine to form peptides. A peptide bond is formed when the carboxyl group of one amino acid reacts with the amino group of another, releasing a molecule of water. This condensation reaction is fundamental to protein synthesis and is a key concept tested in exams.

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Another concept reinforced through Peptide Formation and Amino Acids Chemistry MCQs with Answers is hydrolysis of peptides. Under acidic or enzymatic conditions, peptide bonds can break down to yield individual amino acids.

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Peptide Formation and Amino Acids Chemistry MCQs with Answers:

1. Which of the following is not an essential amino acid?

a) Leucine
b) Valine
c) Lysine
d) Tyrosine
Answer: d

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2.Which of the following represents the correct structure of tyrosine?

a) HO–C₆H₄–CH₂–CH(NH₂)–COOH
b) C₆H₅–CH₂–CH(NH₂)–COOH
c) HO–C₆H₄–CH(NH₂)–COOH
d) HO–C₆H₄–CH₂–CH₂–COOH

Answer: a

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3. Total negative charge in Gly–Glu–Asp–Tyr at pH 12.5

a) 2
b) 3
c) 4
d) 5
Answer: c

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4. Number of peptide linkages

a) 4
b) 3
c) 2
d) 1
Answer: b

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5. Number of amino groups

a) 6
b) 2
c) 5
d) 4
Answer: c

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6. Essential amino acid

a) Phenylalanine
b) Cysteine
c) Alanine
d) Glycine
Answer: a

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7. Product after DNFB reaction

a) R-CH(NH₂)-COOH
b) NH₂CHR²COOH
c) Mixed product
d) NH₂-CR₂’-COOH
Answer: b

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8. Nature at pH < pKa

a) Anion
b) Cation
c) Zwitterion
d) Neutral
Answer: b

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9. No ninhydrin purple colour

a) Proline
b) Glycine
c) Lysine
d) Aspartic acid
Answer: a

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10. Product with benzoyl chloride

a) PhCOCH₂NH₂
b) PhCH₂NH₂
c) PhCONHCH₃
d) PhCONHCH₂COOH
Answer: d

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11. Peptides are formed from

a) Amines
b) Carbohydrates
c) α-amino acids
d) Aromatic amines
Answer: c

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12. DNA pairing

a) A–T, G–C
b) A–C, G–T
c) A–G, C–T
d) A–U, G–C
Answer: a

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13. Chiral amino acid

a) Ethylalanine
b) Methylglycine
c) Hydroxymethyl serine
d) Tryptophan
Answer: c

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14. Aromatic amino acid

a) Lysine
b) Serine
c) Tyrosine
d) Glutamine
Answer: c

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15. Isoelectric point

a) 4.32
b) 3.34
c) 9.46
d) 5.97
Answer: d

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16. Optically inactive amino acid

a) Phenylalanine
b) Glycine
c) Glutamic acid
d) Asparagine
Answer: b

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17. Essential amino acid

a) Tyrosine
b) Cysteine
c) Isoleucine
d) Serine
Answer: c

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18. Molar mass of protein

a) 36500
b) 35400
c) 34800
d) 35600
Answer: d

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19. Glycine in alkaline medium

a) Cation
b) Anion
c) Zwitter ion
d) Covalent
Answer: b

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20. Max tripeptides

a) 4000
b) 6470
c) 7465
d) 8000
Answer: d

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21. Not optically active

a) Lactic acid
b) Serine
c) Alanine
d) Glycine
Answer: d

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22. Chirality in DNA

a) D-sugar
b) L-sugar
c) Bases
d) Phosphate
Answer: a

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23. Amino acids in insulin

a) 25
b) 51
c) 20
d) 22
Answer: b

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24. Mercapto group amino acid

a) Leucine
b) Glutamine
c) Cysteine
d) Lysine
Answer: c

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25. Protein is polymer of

a) Carbohydrates
b) Amino acids
c) Nucleic acids
d) Acids
Answer: b

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26. Base only in RNA

a) Guanine
b) Adenine
c) Cytosine
d) Uracil
Answer: d

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27. Vasodilator

a) Histamine
b) Serotonin
c) Codeine
d) Cimetidine
Answer: a

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28. Not basic amino acid

a) Aspartic acid
b) Lysine
c) Arginine
d) Histidine
Answer: a

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29. Building units of protein

a) α-amino acids
b) β-amino acids
c) γ-amino acids
d) None
Answer: a

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30. Glycine synthesis

a) Strecker
b) Williamson
c) Perkin
d) Coupling
Answer: a

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31. Basic amino acid

a) Histidine
b) Tyrosine
c) Proline
d) Valine
Answer: a

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32. Basic amino acid

a) Valine
b) Tyrosine
c) Arginine
d) Leucine
Answer: c

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33. Forms zwitter ion

a) Aniline
b) Acetanilide
c) Benzoic acid
d) Glycine
Answer: d

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34. Linkage in proteins

a) Peptide bond
b) Dative
c) Glycosidic
d) β-glycosidic
Answer: a

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35. Basic amino acid

a) Serine
b) Alanine
c) Tyrosine
d) Lysine
Answer: d

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36. Non-essential amino acid

a) Lysine
b) Valine
c) Leucine
d) Alanine
Answer: d

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37. Nonessential amino acid

a) Valine
b) Proline
c) Lysine
d) Phenylalanine
Answer: b

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38. Product with nitrous acid

a) Propane-2-ol
b) Cyclopropene
c) Propanol
d) Nitropropane
Answer: a

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39.Which of the following represents the correct structure of the dipeptide Gly–Ala?

a) NH₂–CH₂–CO–NH–CH(CH₃)–COOH
b) NH₂–CH(CH₃)–CO–NH–CH₂–COOH
c) NH₂–CH₂–COOH–NH–CH(CH₃)–COOH
d) NH₂–CH₂–CO–CH(CH₃)–NH–COOH

Answer: a

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40. DNA linkage

a) Phosphodiester
b) Monoester
c) Triester
d) Amide
Answer: a

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41.In a linear tetrapeptide made of different amino acids, what are the number of amino acids and peptide bonds respectively?

a) 4 and 4
b) 5 and 5
c) 5 and 4
d) 4 and 3

Answer: d

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42. At different pH values, alanine exists in different forms. Which pair correctly represents alanine at pH 2–4 and pH 9–11 respectively?

I. H₃N⁺–CH(CH₃)–COOH
II. H₂N–CH(CH₃)–COO⁻
III. H₃N⁺–CH(CH₃)–COO⁻
IV. H₂N–CH(CH₃)–COOH

a) I and II
b) I and III
c) II and III
d) III and IV

Answer: a

In conclusion, Peptide Formation and Amino Acids Chemistry MCQs with Answers are an indispensable resource for aspirants preparing for competitive exams. They not only strengthen conceptual understanding but also improve accuracy and speed, ensuring better performance in exams.