Viruses Flashcards
Common structure of virus
Genetic material enclosed by a capsid (protein) with attachment proteins on outside and sometimes surrounded by lipid envelope
What can the genetic material in a virus be like?
DNA or RNA
Attachment proteins
To attach to cells and then enter host cell
Lipid envelope
Formed from phospholipid belayer of the host cell they attached to
Do viruses reproduce?
No because they are non living
How do viruses multiply?
In virus replication using host cells by injecting their genetic material into host cell
How do viruses enter host cell?
Attachment proteins attach to host cell’s receptor proteins (complementary)
Injects genetic material into host cell
How are new viral parts synthesised by a host cell?
Genetic material is used to encode more capsid and attachment proteins
Then genetic material replicated using cell’s enzymes and ribosomes
How does the host cell assemble more viruses?
Golgi apparatus assembles new virus from the parts that had been synthesised by ribosomes
Once virus replicates, what happens to the hist cell
It bursts and virus can spread through host’s body
Why are viruses no living?
Do not respire
Are acellular
Do not reproduce
