BBCCT-123 IGNOU Handwritten Assignment 2026-27

Course Scope and Syllabus Overview

BBCCT-123: Gene Expression and Regulation is a core component of the Bachelor of Science (Honours) in Biochemistry curriculum under IGNOU’s School of Sciences. This course delves into the molecular mechanisms governing how genetic information is transcribed, processed, and translated into functional proteins, while exploring sophisticated regulatory pathways that control these processes. Students gain a rigorous understanding of transcription factors, epigenetic modifications, and signal transduction networks, equipping them with essential knowledge for advanced research in molecular biology, biotechnology, and genetic engineering. The syllabus integrates theoretical frameworks with practical applications, emphasizing experimental techniques and conceptual models validated through peer-reviewed literature. By analyzing real-world examples—such as bacterial operons, eukaryotic enhancers, and post-transcriptional silencing—students develop analytical skills critical for interpreting complex biological data.

Key Syllabus Units and Topics

• Block-1 Transcription: Covers the molecular machinery of RNA polymerase complexes, promoter recognition, and the roles of sigma factors in prokaryotes and general transcription factors in eukaryotes, including TATA-binding protein (TBP) interactions and basal transcription complexes.
• Block-2 RNA Processing: Examines post-transcriptional modifications such as capping, polyadenylation, and splicing, including alternative splicing mechanisms that generate protein diversity, with case studies on pre-mRNA processing in higher eukaryotes.
• Block-3 Genetic Code and Translation: Explores the decoding of mRNA by ribosomes, the structure and function of transfer RNAs (tRNAs), and the role of elongation factors in protein synthesis, alongside the impact of wobble base pairing on codon degeneracy.
• Block-4 Gene Expression and Regulation: Analyzes regulatory circuits—including operons (e.g., lac and trp systems), hormone-responsive elements, and chromatin remodeling—while addressing epigenetic regulation through DNA methylation and histone modifications.

Frequently Asked Questions

Q: What is the passing mark for the BBCCT-123 assignment in the BSCBCH programme?
A: The minimum passing mark for the handwritten assignment in BBCCT-123 is 40%, calculated based on the total marks allocated to the assignment (typically 30 marks) as per IGNOU’s CBCS grading system.

Q: How does the examination pattern for BBCCT-123 differ from other theory courses in the BSCBCH programme?
A: The course follows a 70% theory (term-end examination) and 30% internal assessment (including the handwritten assignment) weightage, with the term-end exam comprising objective and descriptive questions from all four blocks of the syllabus.