MBC-006 IGNOU Guess Paper 2026-27

MBC-006 Guess Paper: Recombinant DNA Technology (Term-End Exam Focus)

This structured guess paper aligns with IGNOU’s official curriculum for MBC-006, prioritizing high-scoring units and exam patterns from June/December sessions (2018–2023). Key themes include molecular tools, recombinant formation, gene cloning, and applications—with a 30% focus on Block-3 (Gene Cloning) and Block-4 (Applications).

Chapter-wise Weightage & Scoring Strategy

• Block-1: Tools of Recombinant DNA Technology (25%)
  • Restriction enzymes: Mechanism, Type II endonucleases (e.g., EcoRI, BamHI), and sticky vs. blunt ends (10 marks).
  • DNA ligases: Role of T4 DNA ligase in joining fragments (8 marks).
  • PCR: Primer design, thermal cycling, and applications in DNA amplification (7 marks).
• Block-2: Formation of Recombinants (20%)
  • Plasmid vectors: pBR322, pUC19—selection markers (ampicillin resistance, lacZα) (10 marks).
  • Phage vectors (e.g., λ-phage) and cosmid vectors: Cloning capacity and host range (8 marks).
  • Genomic libraries vs. cDNA libraries: Construction and screening (2 marks).
• Block-3: Gene Cloning (30%)
  • Steps of gene cloning: Ligation Transformation Selection Screening (15 marks).
  • Blue-white screening: lacZ reporter system (5 marks).
  • CRISPR-Cas9: Mechanism, genome editing, and off-target effects (10 marks).
• Block-4: Applications (25%)
  • Biopharmaceuticals: Insulin, hGH production via recombinant bacteria (10 marks).
  • Agricultural biotechnology: Bt cotton, herbicide-resistant crops (8 marks).
  • Ethical/legal issues: GMOs, biosafety protocols (7 marks).

Exam Time Management (3 Hours)

• Allocate 45 minutes for reading the question paper and planning answers.
• Prioritize Block-3 (Gene Cloning) and Block-4 (Applications)—these account for 55% of marks.
• For descriptive questions (e.g., PCR steps, CRISPR mechanism), use flowcharts/diagrams where applicable (e.g., restriction enzyme recognition sites).
• Avoid lengthy explanations on theoretical concepts (e.g., restriction enzyme discovery history); focus on mechanisms and applications.

Frequently Asked Questions (FAQs)

• Q: Are practical questions (e.g., gel electrophoresis interpretation) included in TEE?

  Yes. Expect 1–2 questions on interpreting agarose gel results (band sizes, DNA concentration) or designing a cloning experiment. Practice past-year practical questions from 2026-27.