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Lecture 2

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Biology 1002B
Tom Haffie

Hanin AlHjowjLecture 2Cell Biology Chapter 2 Origins of Life 21 What is life21a Seven Characteristics that All Forms of Life Sharea Display order All forms of life are arranged in highly ordered manner with the cell being the fundamental unit of life ex Flowerb Harness and utilize energyAcquire energy from the environment and use it to maintain their highly ordered statec Reproduce All organisms have the ability to make more of their own kind d Respond to stimuli Organisms can adjust their structure function and behaviour in response to the external environmente Exhibit homeostasis Organisms are able to regulate their internal environment such that conditions remain constantf Growth and developmentall organisms increase their size by increasing the size and or number of cells g Evolve Populations of living organisms change over the course of generationsy Viruses seemingly display many of the properties of life including the ability to reproduce and evolve over time y Most scientists do not consider a virus alive 21b Fundamental unit of life is the celly Three tenets of the Cell theory1 All organisms are composed of one or more cells Some types of organisms such as prokaryotes are composed of only a single cell In these unicellular organisms the one cell is a functionally independent organism capable of carrying out all life activities In more complex multicellular organisms including plants and animals major life activities are divided among varying numbers of specialized cells Individuals cells of multicellular organisms are potentially capable of surviving by themselves if placed in a chemical medium that can sustain them2 The cell is the smallest unit that has the properties of life If cells are broken open the property of life is lost they are unable to grow reproduceor respond to outside stimuli in a coordinatedpotentially independent fashion 3 Cells arise only from the growth and division of preexisting cells Although deoxyribonucleic acid DNA and ribonucleic acid RNA
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