Bio Ch1 Sec1 and 2

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Information about Bio Ch1 Sec1 and 2

Published on September 7, 2007

Author: Jmason1



Chapter 1 Lecture slides for Mr. Masons Biology I,Hon. class.

Biology : The Science of Life section 1 The World of Biology section 2 Themes in Biology

Biology and You Biology - “the study of life” the natural world bacteria to elephants food to exercise environment bioethics - biology in context of society

Characteristics of Life Life has changed since it first appeared on the planet, Today, biologist identify a living thing through observation of shared characteristics.

Organization Self-directed Organization cell - basic unit of structure and function (organelles and biomolecules) unicellular or multicellular

levels of organization cells tissues organs organ system organism population --> community --> ecosystem --> biome -->biosphere

Response to Stimuli stimulus-response stimulus - causal event in environment response - reaction to causal event

Homeostasis responses in an organism which maintain stable internal conditions in a changing environment light, temperature, water

Growth and Development growth - increase in size growth - increase in the number of cells through cell division development - series of changes during growth due to cell specialization

Reproduction making more of ones own kind - species asexual sexual Inherited set of instructions in the nucleic acids DNA or RNA

Evolution species change over time mutation variations in a population differential survival due to “fitness”

Metabolism Energy required for each characteristic metabolism - sum of chemical reactions to transform energy to a usable form photosynthesis - respiration provide material for growth and repair

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