BISC 121Lg Chapter Notes - Chapter 31: Arbuscular Mycorrhiza, Nucleariida, Plasmogamy
Document Summary
Chapter 31: they absorb nutrients from the environment, many secrete hydrolytic enzymes into their surroundings, other use enzymes to penetrate cell walls. Fungi live as decomposers, parasites, or mutualists: parasites absorb nutrients from living hosts. Some are pathogenic and disease causing: mutualists absorb nutrients but are also beneficial to the host. Most common fungi structure are multicellular filaments and single celled yeasts: many can grow as both, most grown only as multicellular filaments. Hyphae- tiny filaments that make a network that make up bodies of fungi, tubular cell walls surrounding plasma membrane and cytoplasm. Chitin- strengthen cell walls, strong and flexible polysaccharides: enhance feeding by absorption, helps cell not burst when osmosis occurs. Septa- separate hyphae into cells: large pores to allow ribosomes, mitochondria, and nuclei through. Coenocytic fungi- lack septa and are continuous cytoplasm masses with hundreds to thousands of nuclei: repeated nuclei division without cytokinesis.
