Introduction to Biology

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Presentation transcript:

Introduction to Biology Copyright Cmassengale

Copyright Cmassengale Bell Ringer In order for something to be considered living, it must ………. (list characteristics) Copyright Cmassengale

Copyright Cmassengale Biology The study of living things and their environment Copyright Cmassengale

Characteristics of Life Copyright Cmassengale

Copyright Cmassengale Cells All living things are composed of cells In multicellular organisms, many are specialized to perform specific functions Cells are always very small The size of multi-celled organisms depends on the number of cells NOT their size Copyright Cmassengale

Copyright Cmassengale Energy Use Use energy in a process called metabolism Sum of all chemical processes Require energy to maintain their molecular and cellular organization, grow and reproduce Copyright Cmassengale

Copyright Cmassengale Homeostasis Maintain stable internal conditions Temperature, pH, etc. Copyright Cmassengale

Copyright Cmassengale Growth & Development GROWTH Grow occurs as the result of cell division and cell enlargement Cell division is the formation of two cells from a preexisting cell New cells enlarge as they mature When a cell grows to a size where its surface area isn’t big enough for its volume, the cell divides Copyright Cmassengale

Copyright Cmassengale Growth & Development DEVELOPMENT The process by which an adult organism arise is called development Repeated cell divisions and cell differentiation Copyright Cmassengale

Copyright Cmassengale Reproduction All species have the ability to reproduce Not essential to survival of individual but is essential for continuation of a species Copyright Cmassengale

Living things are based on a universal genetic code (DNA) Heredity Living things are based on a universal genetic code (DNA) Living organisms inherit traits from the parent organisms that created them.

Copyright Cmassengale Responsiveness Respond to stimuli in the external environment Detect and respond to changes in light, heat, sound and chemical and mechanical contact Coordinates it’s responses Copyright Cmassengale

Copyright Cmassengale Evolve Ability to adapt to their environment through the process of evolution Favorable characteristics are selected for and passed on to offspring Called adaptations Driven by natural selection or “survival of the fittest” Copyright Cmassengale