Summary
Summary Biology B Edexcel Viruses Revision notes (A*)
- Module
- Viruses
- Institution
- PEARSON (PEARSON)
Notes covering different viruses that students need to know in the Edexcel Biology B A level course also containing diagrams.
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Viruses➔ Non-living organic particles that are able to replicate in host cells
➔ Capsid - protein coat made up of repeating proteins(capsomeres) surrounding genetic material
➔ Envelope - lipid bilayer derived from host cells → allows to fuse to membrane easily + release genetic
material into target cell
➔ Virulence factors e.g. receptors - used to bind to specific types of cells
o Genetic material can be: ssRNA, dsRNA, ssDNA, dsDNA
Lytic and Lysogenic cycles
, Classifying viruses by genome
➔ 70% of viruses use RNA
➔ ssRNA either positive sense or negative sense
o Positive ssRNA → can be used directly as mRNA for translation by ribosomes
o Negative ssRNA → have to be transcribed before they are translated(antisense)
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