Micro: Fungi, Yeasts, and Molds

cell number of yeast and fungi

• yeast - unicellular

• mold = multicellular

• both have cell wall

cell type

• F: eukaryotic

• B: prokaryotic

Opt. pH

F: 3.8-5.6

B: 6.6-7.5

Opt. temp

• F: 22-30/30-37 (dimorphic)

• B: 20-37 C

O2 Req.

• F: strict aerobes (some yeast are faculative)

• B: aerobic/anaerobic

Light Req.

• F: none

• B: some photosynthesis

Sugar Conc. in Media

• F: 4-5%

• B: 0.5-1%

Carbon Req.

• F: organic

• B: inorg/organic

Cell Wall Comp.

• F: Chitin/Cellulose

• B: Peptidoglycan

Antibiotic Susc.

• F: Resistant to penicillin chloramphenicol, tetracycline, etc.

• B: sensitive to these antibiotics

what were the previous fungi classification system based on

• morphology of their sexual organs and the presence or absence of hyphal cross walls (septa) in their structure

What were the four previous fungi classifications

• phycomycetes

• ascomycetes

• basidiomycetes

• deuteromycetes (fungi imperfecti)