Chapter_3.pdf - Chapter 3 7 characteristics of living...

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Chapter 31Chapter 37 characteristics of living thingsMRS GRENliving things: animals, plants, micro-organisms, fungivirus is not a living thing because they only reproduceTypes of microorganismsalgaephotosynthesiseprotozoafeed on smaller micro-organismsfungihave hyphae → a tangle of thin threads-absorb nutrients from their surroundingsreleasesporesto reproducefungi without hyphae = YEAST-reproduce by buddingbacteriasmallest micro organisms
Chapter 32reproduce by binary fission = splitting in 2MicroscopeFermentationsugary solution → alcohol + carbon dioxideyeastconsumethe sugar in respiration andproducealcohol inside the liquidother bacteria in liquid consume sugar in respiration and produce lactic acidinside the liquid-these bacteria should be killed to prevent liquids such as milk from goingsour; ensures food is freshhow we can keep food fresh:pasteurisation-heating foods to a certain temperature that kills harmful bacteriawithout affecting the flavourkeep in air-tight containersstore in fridges

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