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Chapter 2

Chapter 2 Summary Notes Entire chapter 2 summary, includes all major topics, definitions, and explanations. Cuts all the excess fluff in the textbook, straight to the point biology

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Diane Williams

BI110CHAPTER 221 What is Lifethe differences between abiotic and biotic is a blur The types of atoms and molecules found in living things are no different from those found in nonliving forms of matterliving cells obey the same fundamental laws of chemistry and physics as does the abiotic world21a Seven Characteristics that All Forms of Life Share1Display orderall forms of life are arranged in a highly ordered manner with the cell as the fundamental unit2Harness and Utilize Energyall forms of life acquire energy from the environment and use it to maintain their highly ordered state3Reproduceall organisms have the ability to make more of their own kind4Respond to Stimuliorganisms can make adjustments to their structure function and behaviour in response to change to the external environment5Exhibit Homeostasisorganisms are able to regulate their internal environment such that conditions remain relatively constant6Growth and Developmentall organisms increase their size by increasing the size andor number of cells7Evolvepopulations of living organismscharacteristics of life that a virus possesses are based on its ability to infect other cells 21b The Fundamental Unit of Life Is The CellCell TheoryAll organisms are composed of one or more cellsThe cell is the smallest unit that has the properties of lifeif a cell is broken open they are unable to grow reproduce respond to stimuli etcCells arise only from the growth and division of preexisting cells22 The Chemical Origins of Life22b Conditions on Primordial EarthEvidence using a range of dating methods has firmly established that Earth the Sun and the other planets of the solar system all formed at about the same timeformed by the gravitational condensation of matter present in a molecular cloudintense heat and pressure generated in the central region of the cloud formed the Sun whereas the remainder of the spiraling dust and gas condensed into the planetsOnce Earth was formed its early history was marked by bombardment of rock from the sillforming solar system and extensive volcanic and seismic activityearth radiated away from of its heat and surface layers cooled and solidified into the rocks of the crust
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