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Don’t worry, you’ll Like him, he’s a fungi!

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Don’t worry, you’ll Like him, he’s a fungi!. Kingdom Fungi differ in form, size and color Oldest fossils are 450-500 million years old Most grow best in moist , warm environments between 20-30°C Most are multicellular (except yeasts) Heterotrophic, Decomposers - PowerPoint PPT Presentation
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  • Dont worry, youll Like him, hes a fungi!Kingdom Fungi differ in form, size and colorOldest fossils are 450-500 million years oldMost grow best in moist, warm environments between 20-30CMost are multicellular (except yeasts)Heterotrophic, DecomposersPhylum is replaced with divisionshttp://www.naturegrid.org.uk/biodiversity/crypfungi.html

  • Structure of a FungiHyphae threadlike filaments which develop from fungal sporesHyphae elongate at their tips and branch extensively to form a network of filaments called a mycelium.Mycelium (many types) some anchor the fungus, others invade the food source, or function as a reproductive structure You should take care in eating wild mushrooms, they have evolved to be poisonous!

  • Plants versus FungiLike plants, they grow anchored in the soil and have cell walls.Unlike plants, which have cell walls made of cellulose, fungi use a complex carbohydrate called chitin.Chitin gives the fungal cell walls both strength and flexibility.

  • Fungal FeedingThere are 3 ways heterotrophic Fungi feed:Saprophytes are decomposers and feed on waste or dead organic material.Mutualists live in a symbiotic relationship with another organism like an alga.Parasites absorb nutrients from the living cells of their hostsSpecialized hyphae called haustoria

  • Fungal ReproductionOne important criterion for classifying fungi into divisions is their patterns of reproductionFragmentation pieces of hyphae broken off a mycelium grow into new mycelia.Unicellular fungi (yeast) reproduce by asexual budding.Most fungi produce spores: specialized mycelium called sporangium. Protects the spores before being released and keeps them moist

  • Advantage of SporesProtection from harm (sporangium)Small & lightweight, can be dispersed by wind, water, animalsWind can disperse a spore 100s of kilometers.Produce a large number of spores at one time A puffball 23 cm in circumference produces about 1 Trillion spores!Greater survival in numbersFungi can produce 2 types of spores:Mitosis (asexual phase)Meiosis (sexual phase)

    http://www.youtube.com/watch?v=iPO4Rry4m4U&feature=related

  • Common MoldsMembers of ZygomycotaCalled Pin molds or sugar moldsAttack breads & fruits900 species Root-like hyphae called rhizoids penetrate the breads surface, stem-like hyphae called stolons run along the bread surface

  • Sac FungiAscomycotes have ascus, reproductive structure that contains spores30,000 species Includes: cup fungi, yeast, morels, truffles

  • Club FungiBasidomycotes: have club-shaped hyphae (basidia) which produce basidospores25,000 speciesInclude: puffballs, shelf fungus, mushrooms

  • Imperfect FungiDeuteromycotes: reproduce asexually 25,000 speciesSpecies are varied, can not be assigned to other phylaIncludes penicillin, blue cheese veins

  • A unique fungi: LichenLichen a symbiotic association between a fungus & a green algaOnly need light, air, minerals to growAwesome case of MutualismThe photosynthetic alga provides the food for the organismThe fungus provides the alga with water, minerals and protects it from the environment.

  • Yeast Respiration ExperimentIn this experiment, you will observe cellular respiration in yeast. In each of the four test tubes is Bromothymol Blue (turns yellow when it detects cell respiration) kept at 40 degrees Celsius.

    Test Tube 1 Yeast and SugarTest Tube 2 Yeast, No SugarTest Tube 3 Sugar OnlyTest Tube 4 No Sugar, No Yeast

  • Pre-lab Predictions1. What is the product of cellular respiration that we are trying to detect?2. What type of respiration occurs in yeast? (Hint: no Oxygen needed!)3. Name one of the two constants in this experiment.4. Which test tube # is the control?

    Generate your hypothesis in your notes now!

  • Observe and Reflecthttp://www.youtube.com/watch?v=KTOrpHsbsZQ

    Was your hypothesis supported or rejected?Why or why not?What 3-letter energy carrier is made through this process for the yeast?How do you think you could get the yeast to undergo more cell respiration?

  • Answers1. Carbon Dioxide Gas2. Anaerobic Respiration (Alcoholic Fermentation!)3. Bromothymol Blue or Temperature (40C)4. Test Tube #4 is the controlEnergy Carrier: ATP (2)Add more food! (aka Sugar to the yeast)

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