Textbook Chapter 10 Cucumber Mosaic Virus

Question 1

true or false: cucumber mosaic virus a has very narrow host range, infecting only a few plant species

Answer 1

FALSE!!!! the virus has a wide host range and infects many plant species

Question 2

what are some ways the cucumber mosaic virus can be transmitted?

Answer 2

through aphids and mechanically through parasitic plant and seeds

Question 3

what kind of genome does the cucumber mosaic plant have?

Answer 3

tripartite plus stranded RNA

Question 4

what is special about plant virus genomes?

Answer 4

they are mostly divided, cucumber mosaic virus genomes are packaged along with the genome RNA from which it is derived

Question 5

in brome mosaic virus, what do proteins 1a and 2a do?

Answer 5

1a is the capping enzyme and 2a is the RNA polymerase that act together to assemble viral replication complexes bound to cytoplasmic membranes

Question 6

what does protein 2b do?

Answer 6

suppresses salicylic acid mediated virus resistance and counteracts host antiviral responses by blocking the systemic signal of host RNA silencing

Question 7

what is protein 2b made from?

Answer 7

subgenomic RNA 4a

Question 8

what does protein 3a do?

Answer 8

binds to viral RNAs and forms ribonucleoprotein complex that helps transport viral RNAs through plasmodesmata, facilitating movement of viral genomes and spread of the infection throughout the plant

Question 9

what do small linear satellite RNAs do?

Answer 9

replicate and are encapsidated along with cucumber mosaic virus RNAs can either worsen or attenutate symptoms of infection by the virus