Viruses a level revision
- Created by: Mima
- Created on: 02-12-21 09:24
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- Viruses Revision
- What are they?
- Non living particles-
- Do not have organelles
- No nucleus, ribosomes or mitochondria
- Do not have organelles
- Non living particles-
- Types of virus
- RNA retrovirus
- eg HIV
- Genetic material is a single strand of RNA
- Reverse transcriptase enzyme produces cDNA from RNA template
- Double stranded DNA that is made goes into host cells own genome
- DNA virus
- eg Lambda phage
- Genetic material is DNA which is a template for mRNA transcription
- RNA virus
- eg tobacco mosaic virus, ebola
- Genetic material is RNA
- RNA retrovirus
- Virus replication
- Can only replicate inside a host cell
- Because it has to use the host cells machinery- such as ribosomes
- Ribosomes are involved in protein synthesis to make more viruses
- Because it has to use the host cells machinery- such as ribosomes
- Lytic cycle
- Virus attaches to cell
- DNA or RNA is released into the host cell
- This is replicated using host cell machinery
- New viruses assemble
- They burst out of the cell
- Virus attaches to cell
- DNA or RNA is released into the host cell
- This is replicated using host cell machinery
- New viruses assemble
- They burst out of the cell
- They burst out of the cell
- New viruses assemble
- This is replicated using host cell machinery
- DNA or RNA is released into the host cell
- Virus attaches to cell
- They burst out of the cell
- New viruses assemble
- This is replicated using host cell machinery
- DNA or RNA is released into the host cell
- Virus attaches to cell
- Lysogenic cycle
- Same as lytic, but virus lies dormant in cell for a long time
- Can only replicate inside a host cell
- Structure
- Genetic material can be either DNA or RNA
- Attachment proteins on capsid
- Known as viral antigens
- What are they?
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