Chapter 1 Life Chemical Cellular Evolutionary Functions How we Study Life I Scientific Method A Observations B Hypothesis tentative explanation of your observation C Prediction D More observations get some data 1 If data supports hypothesis repeatedly LOTS of observations hypothesis becomes a theory II Altruism E Theory hypothesis supported by a lot of facts A Defined an interaction that is positive for 1 party and negative for the other Ex Test case guarding behavior in social mammals Meerkats III In Quantifying Life Remember Accuracy vs Precision A Accuracy closeness to true value B Precision how many times you can come out with the same measurement Characteristics of Life the Cell I 5 Characteristics of Life A Uses energy Metabolism B Responds to stimuli C Structurally complex D Changes Responds Response to stimuli E Reproduces F Evolves II Cell A 2 Main Cell Types 1 Prokaryotic the simplest self replicating entity that can exist independently a Aside yeast is a Protist unicellular b We carry 10 prokaryotic cells for every 1 eukaryotic cell c Extremely small compared to eukaryotes a Have internal membrane bound organelles 2 Eukaryotic 3 Comparison of the two in fig 5 16 B Characteristics of all Cells 1 Contain use information genes to reproduce form molecules 2 Are bounded by a plasma membrane 3 Obtain use energy from environment because they re alive Evolution I Basic Ideology A Changes in the genetics of a population over time B There was a single origin of life and thus all life forms share some characteristics C New species arose by the genetic divergence of populations over time
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