BIS 2C Lecture Notes - Lecture 23: Cell Membrane, Mycology, Wood-Decay Fungus
1 Mar 2018
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2/20/2018 evolutionary context probably from a unicellular protist with a agellum. Common ancestor may have been similar to choano agellate. Opisthokont = behind + pole (to push a boat) Fungi sister: animals and choano agelllates coenocytic: without septa septate (incomplete cross walls) with septum that divide it. Refers to a lifecycle that evolved multiple times in tree. Easy to culture and grow, ideal model eukaryote organisms body is a mycelium: composed of tubular laments called hyphae. Advantages: increased surface area to volume ration, directly in concant w/ enironment, allows for absorptive nutrition (by secretion of enzyemes into substrate) Many are saprobes: absorb from dead organic matter. Others are mutualists: live in close association with other living things, mutually bene cial. Lots of debris (fungi are principal decomposers of cellulose, lignin, keratin) Carbon cycle would fail, carbon would be buried (saprobic fungi return carbon to atmosphere as co2 ) No mutualistic interaction w plants (mycorrhizae helped rst land plants)
