Biology A (Salters-Nuffield) A-Level
Histone modification
What Histone modification means in Biology A (Salters-Nuffield) A-Level, as defined for Pearson Edexcel.
Definition of Histone modification
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Reference: Pearson Edexcel
Acetylation or methylation of histone tails changes chromatin packing: acetylation loosens chromatin and increases transcription, while some methylation tightens it and silences genes.
Topics that use Histone modification
- Topic 3: Voice of the Genome (Pearson Edexcel A-Level)
Related terms
- Acrosome
- Acrosome reaction
- Cell cycle and interphase
- Continuous variation and normal distribution
- Cortical reaction
- Differential gene expression
- DNA methylation
- DNA replication and sister chromatids
Using Histone modification in the exam
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