BIOL 2P96 Lecture Notes - Lecture 5: Flowering Plant, Phosphorylase, Bioconversion
27 Jul 2015
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Document Summary
Characteristics of fungi: heterotrophic, absorptive nutrition, use organic components produced by other organisms, secrete digestive enzymes into environment, degraded nutrients are absorbed by osmosis. Localises substrate degradation to immediate vicinity of hypha. Ensures organism producing enzyme has advantage in competition with surrounding organisms for soluble nutrients produced by enzyme activity. Fungus can exert a degree of control over its immediate environment: release of enzymes requires energy, therefore fungi tend to defend territory in which they are seeking food, territorial defense, three general factors in territorial defense: Regulated synthesis of depolymerases to strictly accompany product utilization. Extracellular enzymes: endozymes, exozymes, attack substrate randomly, fragment polymer molecule into a number of oligomers, approach the polymer terminally, digesting away monomers or dimers. Nutrient translocation: bulk flow, whole volumes of solution may be transported from place to place, taking solute molecules with them cytoplasmic streaming in fungi.
