Fungi Flashcards
mycology
study of fungi
fungi
chemoheterotrophs that decompose organic matter; aerobic or facultative anaerobes
cell membrane and cell wall components
sterols in cell membrane; chitin/glucan/mannan cell wall
thallus
body that consists of hyphae filaments
myecelium
mass of hyphae
septate hyphae
contain cross walls (reinforced)
coenocytic hyphae
do not contain septa
vegatative hyphae
obtain nutrients (aerial hyphae, no reproduction)
yeasts
nonfilamentous and unicellular
budding yeasts divide
unevenly
fission yeasts divide
evenly
dimorphic fungi
yeast like at 37 degrees C and mold like at 25 degrees C
life cycle
fungi reproduce sexually and asexually via formation of spores that detach and germinate
asexual spores
produced by mitosis, formed by hyphae of one organism
types of asexual spores
conidiospore, arthrospore, blastoconidiospore, chlamydoconidium, sporangiospore
conidiospore
not enclosed in sac
arthrospore
fragmentation of septate hyphae
blastoconidiospore
buds of the parent cell
chlamydoconidium
spore within a hyphal segment
sporangiospore
enclosed in a sac
sexual spores
fusion of nuclei from two opposite mating strains (positive and negative)
3 phases of sexual spore
plasmogamy, karyogamy, meiosis
plasmogamy
haploid donor cell nucleus penetrates cytoplasm of recipient cell
karyogamy
+ and - nuclei fuse and form diploid zygote
meiosis
diploid nucleus produces haploid nuclei (sexual spores)
nutritional adaptations of fungi
pH of 5, resistant to osmotic pressure, can grow in low moisture, can metabolize complex carbs