How to Revise Cellular control — OCR A-Level Biology
Cellular control is a topic in the OCR A-Level Biology specification. This guide covers learning objectives, examiner tips, common mistakes, and key terminology to help you revise effectively.
Examiner Tips for Cellular control
- Ensure you can clearly define the differences between transcriptional, post-transcriptional, and post-translational control
- Use precise terminology when describing the lac operon mechanism
- Be prepared to apply knowledge of gene regulation to unfamiliar scenarios
Common Mistakes in Cellular control
- Confusing the different levels of gene regulation (transcriptional vs post-transcriptional vs post-translational)
- Failing to distinguish between homeobox genes and Hox genes
- Misunderstanding the role of apoptosis in development
Key Marking Points
- Effects of gene mutations (substitution, insertion, deletion) as beneficial, neutral, or harmful
- Transcriptional regulation via the lac operon and transcription factors
- Post-transcriptional regulation through mRNA editing and intron removal
- Post-translational regulation via cyclic AMP activation of proteins
- Role of homeobox and Hox genes in body plan development
- Significance of mitosis and apoptosis in controlling body form