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NEET-UG and JEE Main Chemistry · Class 12

Amino acids, peptide bond and polypeptides — NEET & JEE Questions

Amino acids, peptide bond and polypeptides is a topic in Biomolecules, a Class 12 Chemistry chapter of the NEET-UG and JEE Main syllabus. TestBudy holds 12 published NEET-UG and JEE Main questions on Amino acids, peptide bond and polypeptides, each with the marking scheme of the real paper.

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Amino acids, peptide bond and polypeptides MCQs with solutions

10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.

  1. Question 1 · difficulty L1 · recall

    The bond linking two amino-acid residues in a peptide is called a

    • A. glycosidic bond
    • B. peptide bond
    • C. phosphodiester bond
    • D. hydrogen bond

  2. Question 2 · difficulty L2 · understanding

    Most alpha-amino acids contain which two functional groups attached to the alpha-carbon?

    • A. amino and carboxyl groups
    • B. aldehyde and ketone groups
    • C. phosphate and thiol groups only
    • D. ether and ester groups

  3. Question 3 · difficulty L2 · understanding

    In aqueous solution, an amino acid commonly exists as a zwitterion because

    • A. it contains both a positively charged ammonium group and a negatively charged carboxylate group
    • B. it loses all protons completely
    • C. it contains no charged groups
    • D. its amino and carboxyl groups are removed

  4. Question 4 · difficulty L2 · understanding

    Formation of one peptide bond between two amino acids is accompanied by elimination of

    • A. one molecule of water
    • B. one molecule of carbon dioxide
    • C. one molecule of ammonia
    • D. one molecule of oxygen

  5. Question 5 · difficulty L3 · application

    How many peptide bonds are present in a linear tripeptide formed from three amino-acid residues?

    • A. 1
    • B. 2
    • C. 3
    • D. 4

  6. Question 6 · difficulty L3 · application

    How many water molecules are eliminated when a linear tetrapeptide is formed from four amino acids?

    • A. 1
    • B. 2
    • C. 3
    • D. 4

  7. Question 7 · difficulty L3 · application

    Which amino acid is achiral because its side chain is hydrogen?

    • A. Alanine
    • B. Valine
    • C. Glycine
    • D. Leucine

  8. Question 8 · difficulty L3 · application

    A molecule contains the linkage −CO−NH−-CO-NH- between two amino-acid residues. This linkage is best identified as

    • A. an ester bond
    • B. a peptide bond
    • C. a glycosidic bond
    • D. an ionic bond

  9. Question 9 · difficulty L4 · application

    A linear polypeptide contains 20 amino-acid residues. How many peptide bonds does it contain?

    • A. 19
    • B. 20
    • C. 21
    • D. 40

  10. Question 10 · difficulty L4 · application

    Complete hydrolysis of a peptide primarily does what?

    • A. Breaks peptide bonds to regenerate amino acids
    • B. Creates additional peptide bonds
    • C. Converts all amino acids into sugars
    • D. Removes every side chain

Common mistakes in Amino acids, peptide bond and polypeptides

Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.

  • Assigns the same acid-base role to both functional groups.
  • Counts residues rather than junctions and therefore overcounts both peptide bonds and water molecules.

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