PLP 3002C Exam 2 Dr. Brantlee questions
with answers
Name the pathogen given these symptoms and description:
Virulence genes on plasmid (Ti-Plasmid) and has an opine catabolism gene on
plasmid, gram negative bacteria
Syptoms:
gall formation near soil line, girdling & plant death - ➰CORRECT ANSWERS
✔✔Crown Gall: Agrobacterium tumefaciens
Name the pathogen given these symptoms and description:
Host = citrus, gram negative bacteria
Symptoms:
Raised spots with oily water-soaked margins and yellow halos; defoliation and
fruit drop - ➰CORRECT ANSWERS ✔✔Citrus Canker: Xanthomonas citri
subsp. Citri
Name the pathogen given these symptoms and description:
,Wide host range (Solanaceae, banana, geranium, pothos), soil inhabitant,
moves upward through the vascular symptom, and can sometimes find
bacteria streaming with this pathogen!
gram negative bacteria
Symptoms:
WILT, vascular discoloration - ➰CORRECT ANSWERS ✔✔Bacterial wilt:
Ralstonia solanacearum
Name the pathogen given these symptoms and description:
Bacteria is fastidious, vector borne (Sharpshooters), only lives on its vector or
on its host plant, and it biotrophic, gram negative bacteria
Symptoms:
Interveinal chlorosis, marginal necrosis, leaf drop (Petioles persist), fruit
shrivels, plant death - ➰CORRECT ANSWERS ✔✔Pierce's Disease: Xylella
fastidiosa
Name the pathogen given these symptoms and description:
Vectored by psyllids, phloem limited pathogen, gram negative bacteria
Symptoms:
, Chlorotic shoots, leaf mottling, small lopsided fruits developed, dieback, tree
death - ➰CORRECT ANSWERS ✔✔Huanglongbing (Citrus Greening):
Candidatus Liberibacter spp.
True or false:
There are very few viruses, and they are hard to find. - ➰CORRECT
ANSWERS ✔✔False: viruses are everywhere!!! You can find them everywhere
and anywhere; the rate of virus discovery is growing rapidly
What was the first viral infection identified? - ➰CORRECT ANSWERS
✔✔Tobacco mosaic disease
What are the sizes and shape classifications used for viruses? - ➰CORRECT
ANSWERS ✔✔Helical - length, width, flexibility
Icosahedral - diameter
1. What is this entire structure called?
2. What are the purple structures (individually)? - ➰CORRECT ANSWERS
✔✔1. Virion
2. Capsid
What nucleic acid do the majority of viral plant pathogens have?
with answers
Name the pathogen given these symptoms and description:
Virulence genes on plasmid (Ti-Plasmid) and has an opine catabolism gene on
plasmid, gram negative bacteria
Syptoms:
gall formation near soil line, girdling & plant death - ➰CORRECT ANSWERS
✔✔Crown Gall: Agrobacterium tumefaciens
Name the pathogen given these symptoms and description:
Host = citrus, gram negative bacteria
Symptoms:
Raised spots with oily water-soaked margins and yellow halos; defoliation and
fruit drop - ➰CORRECT ANSWERS ✔✔Citrus Canker: Xanthomonas citri
subsp. Citri
Name the pathogen given these symptoms and description:
,Wide host range (Solanaceae, banana, geranium, pothos), soil inhabitant,
moves upward through the vascular symptom, and can sometimes find
bacteria streaming with this pathogen!
gram negative bacteria
Symptoms:
WILT, vascular discoloration - ➰CORRECT ANSWERS ✔✔Bacterial wilt:
Ralstonia solanacearum
Name the pathogen given these symptoms and description:
Bacteria is fastidious, vector borne (Sharpshooters), only lives on its vector or
on its host plant, and it biotrophic, gram negative bacteria
Symptoms:
Interveinal chlorosis, marginal necrosis, leaf drop (Petioles persist), fruit
shrivels, plant death - ➰CORRECT ANSWERS ✔✔Pierce's Disease: Xylella
fastidiosa
Name the pathogen given these symptoms and description:
Vectored by psyllids, phloem limited pathogen, gram negative bacteria
Symptoms:
, Chlorotic shoots, leaf mottling, small lopsided fruits developed, dieback, tree
death - ➰CORRECT ANSWERS ✔✔Huanglongbing (Citrus Greening):
Candidatus Liberibacter spp.
True or false:
There are very few viruses, and they are hard to find. - ➰CORRECT
ANSWERS ✔✔False: viruses are everywhere!!! You can find them everywhere
and anywhere; the rate of virus discovery is growing rapidly
What was the first viral infection identified? - ➰CORRECT ANSWERS
✔✔Tobacco mosaic disease
What are the sizes and shape classifications used for viruses? - ➰CORRECT
ANSWERS ✔✔Helical - length, width, flexibility
Icosahedral - diameter
1. What is this entire structure called?
2. What are the purple structures (individually)? - ➰CORRECT ANSWERS
✔✔1. Virion
2. Capsid
What nucleic acid do the majority of viral plant pathogens have?
