BESC 204 Practice Questions with Correct Answers

BESC 204 Practice Questions with Correct
Answers
Oomycota

-not true fungi, more closely related to algae

-kingdom stramenopila

-cellulose walls

-diploid nuclei

-coenocytic (no septa)

-sexual oospores

-asexual zoospores that have two flagella

-biochemical pathway for lysine synthesis is achieved like plants

-ultrastructure of mitochondria is like plants

Phytophthora infestans

oomycete that causes late blight of potato

-caused the potato famine

Koch's Postulates

evidence required to establish etiologic relationship between microorganism and disease

1. microorganism must be observed in every case of the disease

2. microorganism must be isolated and grown in pure culture

3. the pure culture, when inoculated in animals, must reproduce the disease

4. microorganism must be recovered from the diseased animal

Anton de Bary

, father of plant pathology

-discovered phytophthora infestans

Bordeaux Mixture

world's first fungicide

-mixture of copper sulfate and "lime"

-invention was the result of downy mildew of grape

Plasmopara viticola

oomycete that causes downy mildew of grape

Rust Fungus Life Cycle

stage 0 - spermogonia

stage 1 - aeciospores

stage 2 - urediospores

stage 3 - teliospores

stage 4 - basidiospores

Transfer spores

-aeciospores are produced on barberry and can only infect wheat

-basidiospores are produced on wheat plants and can only infect barberry

Puccinia Pathway

route stretching from northern Mexico to northern US and Canada where wheat rust spreads

Wheat Rust

Puccinia graminis

-rusty colored blotches present on stems and leaves (urediospores)