Proteins, structure of proteins — NEET Biology Questions

Practice 20 questions on Proteins, structure of proteins from Biomolecules (NCERT Class 11, Chapter 9). Free samples below — get all 20 in the app.

20 Questions Biomolecules Class 11

Sample Questions — Proteins, structure of proteins

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MCQ
Which of the following structures describes the arrangement of multiple subunits of a protein?
  • A. Primary
  • B. Secondary
  • C. Tertiary
  • D. Quaternary
✅ Correct Answer: D
The quaternary structure explains how subunits are arranged in a multimeric protein like haemoglobin.
MCQ
Identify the incorrect statement:
  • A. Proteins are polymers of amino acids
  • B. Peptide bonds join amino acids in a chain
  • C. The number of subunits determines tertiary structure
  • D. Adult human haemoglobin has four polypeptide subunits
✅ Correct Answer: C
Tertiary structure is the 3D folding of a single polypeptide. Subunit number relates to quaternary structure.
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MCQ
What type of polymer are proteins considered as?
  • A. Homopolymer
  • B. Heteropolymer
  • C. Isomer
  • D. Isotope
✅ Correct Answer: B
Proteins are made from 20 different amino acids, making them heteropolymers.
MCQ
Which of the following describes secondary structure of proteins?
  • A. Position of amino acids
  • B. Helix or folded shape of the chain
  • C. Number of subunits
  • D. Linear sequence only
✅ Correct Answer: B
The secondary structure involves local folding, including alpha-helices and beta-sheets.
MCQ
What type of structure is described as the 3D folding of a protein chain upon itself?
  • A. Primary structure
  • B. Secondary structure
  • C. Tertiary structure
  • D. Quaternary structure
✅ Correct Answer: C
The tertiary structure gives the protein its 3D shape and is essential for biological activity.

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