viruses Flashcards
1
Q
virus shapes?
A
- most are either rod or isometric (football) (95%)
- others are geminate (appear stuck together)
- others are enveloped
2
Q
genome?
A
- most are ss RNA (90%)
- others either dsdna ssdna dsrna
- have small genomes as they code for few proteins
3
Q
symptoms of infection?
A
-mosaic (discolouration)
- dwarfing of plant
rarely kill plant because they need it to replicate
4
Q
infection process?
A
- enter plant cells. usually vector e.g. aphid
- replication to produce copies of genome and coat protein
- reassembly in cell
- spread from cell to cell
5
Q
which 4 basic protein s do viruses have?
A
- protein to be picked up by vector
- protein for genome replication
- protein for encoding coat protein
- protein for moving cell to cell
