BISC 132 Lecture Notes - Lecture 3: Oral Candidiasis, Blastocladiomycota, Dikaryon
26 Sep 2016
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Document Summary
Can be uni- or multi-cellular; multicellular fungi have structures called hyphae. Hyphae: single or branched tubes with multiple nuclei and connected cytoplasm. They are incompletely divided by crosswalls called septa; one hypha is one cell with multiple nuclei. Their construction is accomplished with mitosis that does not lead to cytokinesis. Cytoplasm (which contains nutrients) flows freely, allowing for fast growth. Mycelium: group of hyphae: grows on and through substrate, secretes digestive enzymes and absorbs nutrients, multiple hyphae increase surface area for more efficient nutrient uptake. Due to tiny size, stay suspended in air for a long time. Most are detritivores, breaking down dead organic matter, such as cellulose. Obligate intracellular parasites: only grow and replicate inside a host cell, which they completely take over. The smallest genome of any known eukaryote: steals needed genes from hosts. Life cycle: primary mycelium is haploid, fuses to form secondary mycelium (dikaryotic) 3: diploid zygote produces haploid mating spores.
