Biology A-Level
siRNA and microRNA
What siRNA and microRNA means in Biology A-Level, as defined for AQA.
Definition of siRNA and microRNA
Check what you remember
Read the wording for your board, then hide it and explain siRNA and microRNA in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Double-stranded RNA in the cytoplasm is cut by an enzyme into short lengths of about 21 nucleotides called small interfering RNA; microRNA works in a similar way but pairs less precisely.
Topics that use siRNA and microRNA
Related terms
- complementary base pairing
- correlation not causation
- decreased histone acetylation
- DNA methylation
- environment and gene expression
- genotype versus environment
- histone acetylation
- hypermethylation of tumour suppressor genes
Using siRNA and microRNA in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Biology questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Biology A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge