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Lecture 20

Lecture 20.pdf

by OneClass266583 , Winter 2014
5 Pages
124 Views

Department
Biological Sciences
Course Code
BIOL 1030
Professor
Carla Zelmer
Lecture
20

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Lecture 20 - Microorganisms 2: Fungi & Algae
Fungal Nutrition
-heterotrophic nutrition (contrast w autotrophic nutrition algae)
heterotrophs can not manufacture own food
2 types of heterotrophs:
-saprophytes
obtain their organic compounds from NON-living substrates
substrates are often dead organisms
these are all nutrient sources of organic compounds for heterotrophs
very important for decomposition - nutrient recycling
-parasites
parasites obtain their organic compounds from LIVING substrates
‘host organism
How Do Fungi Extract Nutrients From Substrates?
-animals - mouth, teeth, gizzards, stomach
complex tissues & organs to accomplish this
-unicells (ex. paramecium) take food particles into the cell
broken down by lysozymes
‘intracellular digestion
-fungi can’t access nutrients in these ways
no mouth
rigid cell walls
Digestion in Fungi
-extracellular
-hyphae produce hydrolytic (digestive) enzymes
produced by rough ER (site of ribosomes, protein, & enzyme synthesis)
transported modified, & secreted via the golgi apparatus
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eg. bread mold
-aseptate fungus in zygomycota
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eg. wood decomposition
-sulfur shelf; “chicken of the woods”
-decays wood
-brown rot fungus
-cellulose removed
-wood = xylem
-cell wall components - lignin & cellulose
-cellulose secreted by a fungus causes the breakdown of the cellulose, leaving behind the
brown lignin

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Description
Lecture 20Microorganisms 2 FungiAlgae Fungal Nutrition heterotrophic nutrition contrast w autotrophic nutrition algae heterotrophs can not manufacture own food 2 types of heterotrophs saprophytes obtain their organic compounds from NONliving substrates substrates are often dead organisms these are all nutrient sources of organic compounds for heterotrophs very important for decompositionnutrient recycling parasites parasites obtain their organic compounds from LIVING substrates host organism How Do Fungi Extract Nutrients From Substrates animalsmouth teeth gizzards stomach complex tissuesorgans to accomplish this unicells ex paramecium take food particles into the cell broken down by lysozymes intracellular digestion fungi cant access nutrients in these ways no mouth rigid cell walls Digestion in Fungi
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