Why cells need control
Why cells need control
A cell's behaviour depends on which genes are expressed, when they are expressed, and how strongly they are expressed. Most specialised cells in one organism contain the same DNA, but they make different proteins, so a neurone, muscle cell and epithelial cell do different jobs.
Step-by-step lessons on OCR A A Level Biology Cellular control. Each one builds up to exam-style questions. Build a strong foundation in cell biology and biochemistry early on, since later topics on genetics, ecology and physiology all draw on these core concepts.