viruses

Question 1

virus shapes?

Answer 1

• most are either rod or isometric (football) (95%)
• others are geminate (appear stuck together)
• others are enveloped

Question 2

genome?

Answer 2

• most are ss RNA (90%)
• others either dsdna ssdna dsrna
• have small genomes as they code for few proteins

Question 3

symptoms of infection?

Answer 3

-mosaic (discolouration)
- dwarfing of plant
rarely kill plant because they need it to replicate

Question 4

infection process?

Answer 4

• 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

Question 5

which 4 basic protein s do viruses have?

Answer 5

• protein to be picked up by vector
• protein for genome replication
• protein for encoding coat protein
• protein for moving cell to cell