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Chapter 31
Chapter 31 - Fungi
48
Biology
Undergraduate 1
04/14/2013

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Term
What are fungi more closely related to animals or plants?
Definition
animals
Term
What are hyphae
Definition
small filaments that make up the vegetative body
Term
What are the cells walls mostly composed of?
Definition
Chitin
Term
What plant matter do they usually decay to obtain nutrients?
Definition
lignin and cellulose
Term
Define saprophyte
Definition
fungi that eats dead orgainic matter
Term
describe the nuclei of fungi
Definition
small with little repetitive DNA
Term
True or False: all fungi are non-vascular
Definition
TRUE
Term
Which type of fungi undergo alternation of generations?
Definition
chidtridiomycota
Term
In what form do fungi store their energy?
Definition
Glycogen
Term
TRUE or FALSE: some fungi are photosynthetic
Definition
FALSE
Term
Why do fungi need to live in moist environments to avoid drying out?
Definition
they dry out easily due to the high suface area from the hyphae
Term
WHat are the two growth forms of fungi?
Definition
single cellular yeats and multicellular mycelia
Term
List the four phyla of fungi fro most basal to most derived
Definition
chitridiomycota, zygomycota, ascoycota, basidiomycota
Term
Which group of fungi do not have septa in their hyphae?
Definition
zygomycetes
Term
How do gametes of chytridiomycetes move?
Definition
flagella
Term
True or False the ascomycota undergo only sexual reproduction.
Definition
FALSE! They have both a sexual and asexual
Term
Which type of fungi is most used in the formation of lichens
Definition
ascomycota
Term
Which part of the ascomycese produce spores?
Definition
The asci
Term
How do zygomycota reproduce?
Definition
By yoking their hyphae together
Term
Which phylum of fungi is the kind people usually identify as mushrooms?
Definition
Basidiomycota
Term
What is the lamellae
Definition

spore-bearing 

surface, such as the gills

Term
What is the pileus
Definition
cap found on basidiomycota that bears the gills that carry the basidia
Term
What are ectomycorrhizae?
Definition
the fungus forms an external sheath of mycelium around the root tips, and hyphal cells do not penetrate the cell walls
Term
What are endomycorrhizae?
Definition
the root cortex cells of the plant are invaded by the fungus
Term
What are lichens?
Definition
Lichens are a symbiosis between an alga or a cyanobacteria and a fungus
Term
Why do biologists study fungi?
Definition
- fungi provide nutrients for land plants
- fungi are key model organisms in eukaryotic genetics
Term
What part of the carbon cycle do fungi contribute to?
Definition
The release of CO2 from plants, animals and fungi as a result of cellular respiration
Term
What are mycorrhizal fungi?
Definition
fungi associated with plant roots
Term
How many species of fungi regularly cause illness in humans?
Definition
31
Term
What is the name of the fungi that is used in research on cell biology and molecular genetics?
Definition
Saccharomyces cerevisiae
Term
Why is Saccharomyces cerevisiae so frequently used in research?
Definition
- easy to culture and manipulate in lab
- grows rapidly
- meetings can easily be created and transferred among individuals
Term
What is the estimated total species of fungi?
Definition
1.65 million species or higher
Term
What are the two growth forms of fungi
Definition
- mycelia
- yeasts
Term
What is the typical ploidy of hyphae?
Definition
Haploid
Term
What does heterokaryotic mean?
Definition
Heterokaryotic means having to haploid nuclei (also dikaryotic)
Term
What are septa?
Definition
Septa are cell-like compartments that separate filaments
Term
What is a commensal relationship?
Definition
A commensal relationship is one in which one species benefits while the other is unaffected
Term
What drove the diversification of fungi?
Definition
The evolution of novel methods were absorbing nutrients from a wide array of food sources drove the diversification of fungi
Term
What is an endophytic association?
Definition
An endophytic association is an association between a plant and a fungi that occurs above ground
Term
What group of fungi comprises most EMF?
Definition
Basidiomycetes
Term
Describe the mutualistic relationship between EMF and plants
Definition
EMFs provide nitrogen and phosphate ions to the host plant and receive sugars and other complex carbon compounds in return
Term
What is the name of the fungi that grow into the cells of root tissue?
Definition
Arbuscular mycorrhizal fungi (AMF)
Term
What do AMF provide to plants?
Definition
AMF provide phosphorus to the plants, but they do not provide nitrogen
Term
True or False: most endophytic fungi are parasitic
Definition
False: endophytes are not parasitic
Term
How do saprophytic fungi feed?
Definition
Saprophytes seek out large, complex molecules such as cellulose, lignin, proteins and nucleic acids and break them down into hundreds or thousands of smaller compounds
Term
True or False: fungi and a few bacterial species are the only organisms that can digest wood completely
Definition
True
Term
Describe the process of extracellular digestion?
Definition
The fungi secrete enzymes
Compounds resulting from enzymatic action are then absorbed by the hyphae
Term
What does coenocytic mean?
Definition
Coenocytic means the hyphae lack septa
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