# Explain how the regulation of gene expression at the transcriptional level contributes to the coordinated response of a cell to an environmental stress.

> OCR A-Level Biology A (H420) — 6.1 Cellular control · Explain · 4 marks

## Mark scheme (4 marks)

1. Understanding the role of transcriptional regulation in responding to environmental stress
2. Describing the key mechanisms involved in transcriptional regulation in response to environmental stress
3. Evaluating the importance of transcriptional regulation in maintaining cellular homeostasis

## Related

- [Revision notes for OCR A-Level Biology A (H420)](https://www.gradenine.co.uk/learn)
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