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BESC 204 - Exam 2 Questions and Answers 2024
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BESC 204 - Exam 2 Questions and Answers
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BESC 204 - Exam 2 Questions andAnswers
What are oomycota? How do they compare to 'True Fungi?' - Answer --water molds
found in moist or watery environments
-offshoot of Protista > more closely related to plants
-Have the same growth habit and appearance as true fungi
-Create zoospores (asexual) and oospores (sexual)
Differences between Oomycetes and True Fungi - Answer --Derive from algae
-Cell walls have cellulose
-Nuclei are diploid
-No septa are formed
-Zoospores make two flagella
-Lysine synthesis is achieved like plants
-Mitochondria is more like a plant's
How did the potato famine affect world events? - Answer --Most profound illustration of
direct impact of fungi on human affairs
-Destroyed the crop that sustained most of Ireland
-Caused millions to emigrate > faced discrimination
-Led to debates in early mycology
What role did the potato famine have on our understanding of microorganisms? -
Answer --Caused debate about whether fungi could cause disease in scientific literature
-DeBary discovered that potatoes inoculated with fungi could cause late blight > figured
out that fungi caused disease
Koch's Postulates - Answer -a sequence of experimental steps for directly relating a
specific microbe to a specific disease
1)Microorganism must be observed in every case of the disease
2)It 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
What invention was made possible by the downy mildew of grape? - Answer -Bordeaux
mixture > copper sulfate and lime spray
, Cause of late blight of the potato - Answer --Phytophthora infestans
-Destroyed leaves and tubers
-Sporangia form on cull piles and blow to other plants
-Cool and wet temperatures perfect > enzymes kill plant tissue
Cause of downy mildew of grape - Answer --Plasmopora viticola
'Fungi' causing diseases - Answer -Not true fungi that are actually causing disease >
caused instead by oomycetes that are more closely related to algae
Life cycle of wheat rust fungus - Answer -
What are the five spores produced by a typical rust fungus? - Answer -0: Spermogonia
1: Aeciospores
2: Urediospores
3: Teliospores
4: Basidiospores
What spores are the 'transfer spores' in a typical rust life cycle? - Answer -Aeciospores
and Basidiospores
What is the Puccinia Pathway? - Answer -Area from Texas to Canada where Wheat
rusts extend
Fungus name of Wheat Rust - Answer -Puccinia graminis
Effected crop of Wheat Rust? - Answer -Wheat
Fungus name of Coffee Rust - Answer -Hemileia vastatrix
Effected crop of Coffee Rust - Answer -Coffee bean plants
Fungus name of Stinking Smut - Answer -Tilletia foetida
Effected crop of stinking smut - Answer -wheat
Who is Robigus? - Answer -The Roman god of Rust
How did Ginger Bread originate? - Answer -A baker who had contaminated stinking
smut flour, but didn't want to waste it, used molasses to cover up the flour's dark color
and ginger to cover up the flour's taste and odor. Thus, he invented gingerbread.
Teliospore to Basidospore develpment - Answer -Teliospores develop into
basidiospores that infect barbarry leaves
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