Viruses
- Created by: chloe
- Created on: 25-04-13 14:17
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- Viruses
- Structure
- has either DNA or RNA
- protein coat (capsid)
- smaller than bacteria
- range in size from about 20-30 nanometres
- host cell
- obligate parasite: needs a host cell to multiply
- some enter host cell
- specific to certain host cells
- some inject DNA into the host cell
- can lie dormant in a host cell for years
- takes over host cell and stops normal cell functions -> protein/ DNA synthesis
- uses nucleotides, ATP and amino acids to multiply and make more of its own DNA and protein coats
- uses these to build more viruses
- all new viruses leave the cell by bursting it or by budding
- uses these to build more viruses
- Retrovirus
- RNA instead of DNA
- with the RNA there is an enzyme called reverse transcriptase
- HIV
- glycoprotein on the surface attached to the host cell
- T helper
- glycoprotein on the surface attached to the host cell
- if DNA mutates a vaccination will not work
- Structure
- glycoprotein on the surface attached to the host cell
- T helper
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