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Chapter 12, part A

Chapter 12, part A. The Eukaryotes: Fungi, Algae, Protozoa, and Helminths. Fungi, Algae, Protozoa and Helminths. Table 12.1. The Fungi. Eukaryotic Aerobic or facultatively anaerobic Chemoheterotrophic Most are decomposers Mycology is the study of fungi

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Chapter 12, part A

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  1. Chapter 12, part A The Eukaryotes: Fungi, Algae, Protozoa, and Helminths

  2. Fungi, Algae, Protozoa and Helminths Table 12.1

  3. The Fungi • Eukaryotic • Aerobic or facultatively anaerobic • Chemoheterotrophic • Most are decomposers • Mycology is the study of fungi • Live as unicellular yeast and/or molds

  4. Mycology: The Study of Fungi Table 12.2

  5. Fungus

  6. Molds • Formed by filaments of hyphae. • A mass of hyphae is mycelium. • The fungal thallus is a body of hyphae. • Maybe septate or aseptate Figure 12.2

  7. Yeasts • Unicellular fungi • Budding yeasts divide asymmetrically • May form short hyphae called pseudohyphae Figure 12.3

  8. Dimorphism • Pathogenic dimorphic fungi are yeastlike at 37°C and moldlike at 25°C Figure 12.4

  9. Fungal Life Cycle Figure 12.7

  10. Asexual spores • Sporangiospores • Enclosed in sporangium • Sporangiophore • Holds up the sporangium • Chlamydospore - thickened • Conidiospore • (free not enclosed) • Arthrospore - joint • Blastoconidium - budding Figure 12.1

  11. Conidiospores Figure 12.5

  12. Sexual reproduction • Plasmogamy Haploid donor cell nucleus (+) penetrates cytoplasm of recipient cell (–) • Karyogamy + and – nuclei fuse • Meiosis Diploid nucleus produces haploid nuclei (sexual spores)

  13. Sexual spores • Zygospore Fusion of haploid cells produces one zygospore Figure 12.6

  14. Sexual spores • Ascospore Formed in a sac (ascus) Figure 12.7

  15. Sexual spores • Basidiospore Formed externally on a pedestal (basidium) Figure 12.8

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