Biol_1001_Chap1

Biol_1001_Chap1 - 1 NOTES FOR BIOLOGY 1001 SECTIONS 003 and...

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NOTES FOR BIOLOGY 1001 SECTIONS 003 and 007 Fall 2011 DR. STEVEN POMARICO, INSTRUCTOR CHAPTER 1 AN INTRODUCTION TO LIFE ON EARTH What is Biology? --- The science of living organisms and life processes. O.K., so what is science? And If biology is the science of “life,” what exactly is life? We all recognize what life is, but it’s difficult to define. The characteristics of life : 1) -Complex, organized structure 2) -Homeostasis - the ability to maintain the structure and regulate the internal environment. 3) -Response to stimuli - a change outside (or inside) leads to another change 4) -Ability to acquire material and energy >The material and energy are often transformed< 5) -Growth 1
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6) -Reproduction - either sexual or asexual >DNA is genetic information, the “blueprint” for the offspring< 7) -Ability to evolve - to change to fit the environment Complex, organized structure The complexity of life is built in levels. (see fig 1-1) Each level has ingredients or components which interact to make something greater than the sum of the parts. 1 -Subatomic particles -Atoms -Molecules -Organelles (not present in prokaryotes) -Cells -Tissues (present only in multicellular eukaryotes) -Organs (present only in multicellular eukaryotes) -Organ systems (present only in multicellular eukaryotes) -Multicelled organisms -Populations -Community -Ecosystem -Biosphere Homeostasis
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This note was uploaded on 10/25/2011 for the course BIOL 1001 taught by Professor Minor during the Fall '08 term at LSU.

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Biol_1001_Chap1 - 1 NOTES FOR BIOLOGY 1001 SECTIONS 003 and...

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