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Fungi
Vocabulary
35
Biology
12th Grade
12/19/2007

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Term
Exoenzymes
Definition

powerful hydrolytic enzymes that are secreted by fungi that enable them to digest food while it is still in the environment; help break down complex molecules to smaller organic compounds that the fungi can absorb into their bodies and use

Term
Hyphae
Definition
tiny filaments composed of tubular cell walls surrounding the plasma membrane and cytoplasm of the cells
Term

Chitin

Definition

strong but flexible nitrogen-containing polysaccharide that is also found in the external skeletons of insects and other arthropods; what the fungal cells walls are made up of

Term
Mycelium
Definition
interwoven mass of hyphae that surrounds and infiltrates the material on which the fungus feeds. The structure of the mycelium maximizes the ratio of its surface area to its volume, making feeding more efficient; grow rapidly as proteins and other materials synthesized by the fungus are channeled through cytoplasmic streaming to the tips of the extending hyphae
Term
Septa
Definition

crosswalls in which the hyphae are divided; have pores large enough to allow ribosomes, mitochondria, and even nuclei to flow from cell to cell; some fungi lack septa

Term
Coenocytic  fungi
Definition
lack septa; consist of a continuous cytoplasmic mass containing hundred/thousands of nuclei; coenocytic condition results from repeated division of cuclei without cytoplasmic division
Term
Haustoria
Definition

specialized hyphae that allow fungi to penetrate the tissue of their hosts

Term
Mycorhizzae
Definition
mutually beneficial relationships between fungi with haustoria and plant roots; can deliver phosphate ions and other minerals to plants, which the plants themselves cannot acquire on their own à plants supply fungi with organic nutrients
Term
Ectomycorhizzal fungi
Definition

form sheathes of hyphae over the surface of the root and also grow into the extracellular spaces of the root cortex

Term
Endomycorhizzal fungi
Definition
extend their hyphae through the root cell wall and into tubes formed by invagination (pushing inward) of the root cell membrane
Term
Pheromones
Definition

sexual signaling molecules; released by hyphae of two different mycelia à begins sexual reproduction

Term
Plasmogamy
Definition
union of the cytoplasm of the two parent mycelia
Term
Heterokaryon
Definition

parts of the mycelium that are coexisting, genetically different nuclei ; in some species, become mosaics with different nuclei resitrcted to different parts of the network; in some species, the different nuclei mingle and may even exchange chromosomes and genes ]

Term
Dikaryotic
Definition

mycelium in which the haploid nuclei pair off two to a cell, one from each parent; as dikaryotic mycelium grows, the two nuclei in each cell divide without fusing

Term
Karyogamy
Definition

second stage in the sexual cycle during which the haploid nuclei contributed by the two parents fuse, producing diploid cells; zygotes and other transient structures form during karyogamy; the only stage in which diploidy exists in most fungi

Term
Mold
Definition

fungi that can produce asexually; furry; grow rapidly as mycelia and produce spores; many species can also reproduce sexually if they come into contact with the other mating types

Term
Yeast
Definition

asexual fungi that are unicellular and inhabit liquid or moise habitats including plant sap and animal tissues; reproduce asexually by simple cell dividsion or by pinching of small “budd cells” off a parent cell; some can also grow in filamentous mycelia

Term
Deuteromycetes aka imperfect fungi
Definition
yeasts and molds that have no sexual stage
Term
Opisthokonts
Definition
the three groups of eukaryotes – fungi, animals, and their protistan relatives -  that probably all had flagellated ancestors
Term
Chytrids
Definition

fungi that are found in lakes and soil; some are saprobes, others prasitize protists, plants, animals; probably diverged earliest in fungal evolution; some form colonies with hyphae, others as single spherical cells; unique because they have flagellated spores = zoospores

Term
Zygomycetes
Definition

diverse group of fungi ; includes fast-growing molds responsible for rotting produce; parasites; neutral symbionts of animals

Term
Zygosporangium
Definition

sturdy structure, produced by plasmogamy, in which karyogamy and meiosis occur

Term
Glomeromycetes
Definition

fungi that were formerly thought to be zygomycetes and are now separate; form a distinct type f endomycorhizzae called arbuscular mycorhizzae

Term
Arbuscular mycorhizzae
Definition

type of endomycorrhizzae formed by glomeromycetes;the tips of hyphae that push plant root cells and branch into treelike structures

Term
Ascomycetes (sac-fungi)
Definition
range in size and complexity from unicellular yeasts to minute leafspot fungi and morels; about half of these sac fungi live with algae or cyanobacteria in lichens
Term
Asci
Definition

a saclike spore capsule located at  the tip of a dikaryotic hypha of a sac fungus

Term
Ascocarps
Definition
the fruiting body of  a sac fungus
Term
Conidia
Definition
asexual spores that are the means by which ascomycetes reproduce
Term
Basidiomycetes (club fungus)
Definition

have club shape basidium; include molds, mutualists that form micorhizzae, and rust and smuts (two groups of destructive parasites); decomposers of wood and plant material

Term
Basidium
Definition
cell in which a transient diploid stage occurs during the fungal life cycle
Term
Basidiocarps
Definition
elaborating fruiting body of a dikaryotic mycelium of a club fungus
Term
Lichens
Definition

symbiotic association of millions of photosynthetic microorganizma held in a mass of fungal hyphae

Term
Soredia
Definition
small clusters of hyphae with embedded algae
Term
Mycosis
Definition
general term for fungal infection
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