Concepts and formula to Remember

Transcription:

• Process of copying DNA information into RNA.
• Occurs in the nucleus of eukaryotic cells.

RNA Polymerase:

• Enzyme responsible for transcription.
• Binds to the promoter region of DNA.

Promoter:

• Specific DNA sequence before the coding region.
• Recognized by RNA polymerase to initiate transcription.

Sigma Factor:

• In prokaryotes, guides RNA polymerase to the promoter.

Transcription of Protein-Coding Gene:

• Copies genetic information from DNA to mRNA.

Promoter Proximal Element:

• Regulatory DNA sequence near the promoter.
• Influences transcription initiation.

Mature mRNA Structure:

• 5’ Cap: Added to the 5’ end for stability and translation.
• Coding Region (Exons): Contains protein-coding sequences.
• 3’ Poly-A Tail: Added to the 3’ end for stability and export.

Production of Mature mRNA:

• Involves transcription, capping, polyadenylation, and splicing.

5’ Modification (Capping):

• Protects mRNA from degradation.
• Facilitates export and translation.

Processing of Pre-mRNA to Mature mRNA:

• Steps include capping, polyadenylation, splicing, and transport.

Steps of Pre-mRNA Processing:

• Transcription, capping, polyadenylation, splicing, and transport.