Chapter_31_Fungi - CHAPTER 31 THE KINGDOM FUNGI 1 Fungi are...

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1 CHAPTER 31 THE KINGDOM FUNGI
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2 Fungi are monophyletic Live in substrate: soil, rotting log, piece of bread, living tissue, etc. Fungi are closely related to animals Both heterotrophic – cannot produce their own food Both use absorptive nutrition – secrete enzymes and absorb resulting small organic molecules
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4 Unique cell-wall chemistry Fungal cells enclosed by tough cell walls composed of chitin Chitin: polysaccharide containing nitrogen Also found in exoskeleton of arthropods Cannot engulf food by phagotrophy due to rigid cell walls Cell wall also restricts mobility of nonflagellate cells
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5 Unique body form Most have mycelia composed of hyphae Most of the mycelium is diffused and inconspicuous fruiting bodies are the visible reproductive structures mushrooms are one type Produce spores Rhizomorphs are fungal mycelia with the shape of roots to transport water
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9 Distinctive growth processes Mycelia can grow quickly when food is plentiful Grow at the edges Narrow dimensions and extensive branching provides large surface area for absorption Osmosis important in growth- entry of water produces force for tip extension
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11 _ Septa - Cross _ Each cell has 1 or 2 nuclei Nuclear division followed by cross-wall formation __ Not partitioned into smaller cells __ Nuclei divide without cytokinesis
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13 Intranuclear spindle distinguishes fungal nuclear division from plants and animals Spindle forms inside nucleus and nuclear envelope does not break down Natural mycelium may be irregular in shape In liquid culture it is spherical On agar it is more 2 dimensional
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Sexual reproduction Involves mating of gametes, zygote
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This note was uploaded on 03/01/2012 for the course BIOL 111 taught by Professor Patton during the Spring '12 term at University of Louisiana at Lafayette.

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Chapter_31_Fungi - CHAPTER 31 THE KINGDOM FUNGI 1 Fungi are...

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