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4.05.06 L70 - April 5 2006 Lecture 70 Fungi FUN FUNGAL...

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April 5, 2006 Lecture 70: Fungi  F UN  F UNGAL  F ACTOIDS : Armillaria Ostoyae – the honey mushroom is the larest organism in the world! M AIN  T ROPIC  S TRUCTURE Hyphae – normally they are underground, but then they coalesce and grow up to form  fruiting body (mushroom cap) Underground [internal] dining o Cell wall in the hyphae is made of chitin (polysacc analogous to cellulose) o They do not have cell walls between cells, so they are multi-nucleated (aka  coenocytic ) o The build septum with pores to separate the nuclei and cytoplasm in to cells.  o Produce exozymes te eat (heterotrophic). o Theoy are saprobes—they eat dead matter. Above ground—fruiting bodies. L IFE  C YCLES Waay more complex Instead of fusing at fertilization, the nuclei remain separate and continue to undergo  mitosis They are dikaryotic [N+N].  They then fuse (fertilization, karyogamy).to form a zygote
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