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Bio Test chap 31 Flashcards

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341916386Fungi are _________ organisms.chemoheterotrophic
341916387Parasitic fungi are responsible for about 80% of diseases that affect _______.plants
341916388There is a fungus in Oregon that covers 890 hectares! The bulk of this fungus is most likely _____.mycelium
341916389In fungi, the function of the mycelium is _____.obtaining food
341916390Fungi that consist of a continuous mass containing hundreds or thousands of nuclei are known as _____.coenocytic
341916391The hyphae of parasitic fungi that are modified to penetrate and absorb nutrients from host tissue are called _____.haustoria
341916392You can buy micorrhizal fungus to add to soil when you plant trees and other plants. Why would you want to do this?Mycorrhizal fungi assist plants in the absorption of essential nutrients.
341916393Which choice below generally represents the correct order of events in fungal sexual reproduction?plasmogamy, karyogamy, meiosis, germination
341916394Which of the following statements about fungi is true?The dominant stage of the life cycle is usually haploid. The haploid nuclei of dikaryotic hyphal cells fuse to form a diploid zygote. Many species obtain their nutrients from decaying organic matter. Spores germinate and then mitotically divide to form a mycelium. all of the above
341916395What role do pheromones play in fungal sexual reproduction?Fungi use these chemical signals to determine whether a potential sexual partner is of a suitable mating type.
341916396Hyphae with two nuclei per cell are called _____.dikaryotic
341916397During what stage of fungal reproduction are diploid cells produced?karyogamy
341916398Fungal species are classified in a particular phylum based on _____.the type of sexual structure they form
341916399Molecular evidence suggests that fungi _____.and animals have a common ancestor
341916400In contrast to plants, the cell walls of fungi are composed of _____.chitin
341916401Evidence that mycorrhizae, the mutualistic relationship between plants and fungi, existed from the beginning of the colonization of land comes from _________.fossils
341916402Which feature below is unique to chytrids?zoospores (flagellated spores)
341916403Which statement below about zygosporangia is true?They are metabolically inactive. They are resistant to freezing and drying. They are multinucleate formations. They are produced through plasmogamy. all of the above
341916404What is the major feature of glomeromycetes?arbuscules
341916405An ascus is _____.a saclike structure containing spores
341916406The asexual spores produced by members of the phylum Ascomycota are called _____.conidia
341916407The mushroom in a basidiomycete life cycle serves the same function as the _____ in the ascomycete life cycle, which is to _____.ascocarp; scatter sexually produced spores
341916408While hiking through a forest, you discover a fungus growing on the remains of a decaying tree trunk. You hypothesize that it is a basidiomycete fungus because it resembles a mushroom in shape and size. If your logic is correct, microscopic analysis of the tissue found in the stalk of this fungus will reveal the presence of _____.dikaryotic cells with haploid nuclei
341916409Fungi in the phylum Basidiomycota are the most important decomposers of wood because of their ability to break down _________.lignin
341916410What is the importance of the extended dikaryotic stage in the life cycles of basidiomycetes and ascomycetes?It allows for many genetic recombinations to occur.
341916411Where and when does fertilization occur in the mushroom life cycle?in a mushroom, when the nuclei of a dikaryotic cell fuse
341916412Lichens are _____.symbiotic associations of photosynthesizers and fungi
341916413Lichens are important pioneers in areas that have been burned by fires or destroyed by lava flows because _____.they are important in the initial stages of soil formation
341916414A dramatic example of the pathogenicity of certain fungi is the virtual elimination of the American elm by _____.an ascomycete
341916415Two of the most common mycoses (fungal infections) in humans are _________.athlete's foot and yeast infections

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