Micro Lecture 5 Flashcards
Name how fungi obtain energy, respirate, and name type of cell wall.
- Chemoheterotrophs (decompose org. matter)
- Aerobic/facultative anaerobic
- Chitin cell walls
Define mycelium, septate hyphae, coenocytic hyphae
Mycelium: mass of hyphae
Septate: cross-walls
Coenocytic: do not contain septae
What are vegetative hyphae for?
Obtaining nutrients
What is difference between budding and fission yeasts?
Budding: divide unevenly, ex. candida albicans
Fission: evenly, ex. schizosaccharomyces
What are dimorphic fungi?
Can grow as mold (25 C, environment, produce hyphae) or as yeast (37 C, in body)
How do fungi reproduce?
Sexually and asexually, via spores
Conidiospore
Not enclosed in sac
Sporangiospore
Enclosed in sac
Define plasmogeny, karyogamy, meiosis
Plasmogeny: donor + cell penetrates recipient - cell
Karyogamy: + and - nuclei fuse into diploid zygote
Meiosis: diploid nucleus produces haploid spores
What pH do fungi grow best at?
5
Define mycosis and name types
Fungal infection (systemic, subcu, cut, superficial, opportunistic)
Name two types of systemic mycoses
Histoplasmosis (resp tract infection) and coccidioidomycosis (valley fever)
What are pathogenic properties of fungi?
Toxic metabolic products, provoke allergic response, proteases modify host cell membrane
Name 3 fungal toxins
Ergot, aflatoxin, mycotoxin
What is prime target of antifungals?
Sterols
