Epigenetic Control of Gene Expression (AQA A-Level Biology): Quizzes
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10 questions from this quiz
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Practise the questions
10 questions from this quiz
How do epigenetic changes differ from genetic mutations?
How do epigenetic changes differ from genetic mutations?
Epigenetic changes are reversible
What role does the epigenome play in cells?
What role does the epigenome play in cells?
Acts as cellular memory
What characterises loosely packed chromatin (euchromatin)?
What characterises loosely packed chromatin (euchromatin)?
DNA accessible, genes switched on
What happens when acetyl groups are removed from histones?
What happens when acetyl groups are removed from histones?
Histones become more positively charged
How does DNA methylation inhibit transcription?
How does DNA methylation inhibit transcription?
Blocks factors & promotes deacetylation
Which combination silences gene expression?
Which combination silences gene expression?
Decreased acetylation, increased methylation
How is maternal care behaviour inherited in rats?
How is maternal care behaviour inherited in rats?
Through methylation patterns in epigenome
How does hypermethylation contribute to early cancer development?
How does hypermethylation contribute to early cancer development?
Silences genes that prevent cancer
What do demethylating drugs achieve in epigenetic therapy?
What do demethylating drugs achieve in epigenetic therapy?
Remove methyl groups, reactivate silenced genes
How does RNA interference (RNAi) control gene expression?
How does RNA interference (RNAi) control gene expression?
siRNA breaks down specific mRNA molecules