Tidal forces provide enough heat to melt ice and

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Tidal forces provide enough heat to melt ice and produce ocean undersurface-Surface observatons suggest surface cracks and that water seeps out ofsurfaceGanymede and Callisto-It has been suggested Ganymede may have internal oceanNASA planning Europa Multple Flyby Mission8.6 Saturnian System MoonsEnceladus-The Cassini mission has discovered geysers + ice-Indicatons of internal heat source, might have an internal oceanmaintained by tdal heatngTitan-Has a methane cycle with liquid methane so possible life based on asolvent other than waterLesson 9 – What if Life?9.1 Propertes of LifeOrganisatonGrowth and developmentResponse to environment – homeostasis, etcDownloaded by Andy Chau ([email protected])lOMoARcPSD|9208804
ReproductonUse energyEvoluton9.2 Defning LifeIt is difcult to defne life as some of the above propertes may not apply toevery organism9.3 Classifying Living OrganismsEvery organism has a genus and a species –Homo sapiensTaxonomy– system of classifying living organismsKingdomPhylumClassOrderFamilyGenusSpecies9.5 Evoluton by Natural SelectonDarwin’s theory of evoluton by natural selecton proposes species changeover tme because the ofspring that inherit favourable traits from theirparents are more likely to survive and therefore reproduce and pass thesetraits9.6 Heredity and VariatonFor evoluton to occur, it depends on:1. Heredity-Ofspring inheritng parents traits2. Variaton-Mutatons-Sexual reproducton9.7 Evidence for EvolutonEvidence:The fossil recordArtfcial selectonEvoluton in actonHuman evolutonEvidence from DNA9.8 The Basis of HeredityDNA, RNA and Proteins9.9 DNADownloaded by Andy Chau ([email protected])lOMoARcPSD|9208804
DNA has 4 basesAT and CG join each otherTwo halves of helix can be separated, new strand added to make 2 new copiesof original9.10 RNARNA has Uracil instead of ThymineSingle stranded, info is transferred from DNA to RNA9.11 ProteinsProteinsenzymesspeed chemical reactonsessental for cellularprocesses to occur3D shape containing an actve site9.13 Key Processes in Molecular BiologyReplicaton– copying of DNA-Unzipping of DNA molecule, adding new complementary strand to eachhalf making 2 new copies of originalTranscripton– copying from DNA to RNA-mRNA is made carrying a sequence copied from part of the DNATranslaton– protein molecule is built based on mRNA sequence-Codons specify amino acids-tRNA’s allow producton of proteins in ribosomes9.14 Energy and LifeAutotrophs –obtain energy from light or inorganic chemical reactons-Chemoautotrophs– obtain energy from inorganic chemical reactons-Photoautotrophs– obtain energy from sunlightHeterotrophs– obtain energy from other organisms (food)9.15 PhotosynthesisCO2 + H2O + energy (light)glucose + O2Provides energy to organism9.16 RespiratonEnables energy stored in glucose and molecular oxygen to be usedGlucose + O2H2O + CO2 + energyProduces ATP energyLesson 10 – The History of Life on Earth10.1 The Fossil RecordHistory of life studied through:

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Term
Three
Professor
Bailey
Tags
Solar System, Planet, Sumerians

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