introduction to biology

introduction to biology - Introduction to Biology...

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1 Introduction to Introduction to Biology Biology Copyright Cmassengale
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2 Biology – The Study of Life Biology – The Study of Life Life arose more than 3.5 billion years ago First organisms (living things) were single celled Only life on Earth for millions of years Organisms changed over time (evolved ) Copyright Cmassengale
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3 New organisms arose from older kinds Today there are millions of species They inhabit almost every region of Earth today Copyright Cmassengale
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4 Themes of Biology Themes of Biology Cell structure and function Stability and homeostasis Reproduction and inheritance Evolution Interdependence of organisms Matter, energy, and organization Copyright Cmassengale
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5 Cell Structure and Function Cell Structure and Function Cell basic unit of life All organisms are made of and develop from cells Some composed of only a single cell (unicellular) which is usually identical to parent Copyright Cmassengale
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6 Cells Cells Most organisms are composed of many cells (multicellular) Cells are different (undergo differentiation) Cells are small Cells are highly organized Copyright Cmassengale
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7 Cells contain specialized structures (organelles) that carry out the cell’s life processes Many different kinds of cells exist All cells surrounded by a plasma membrane Contain a set of instructions called DNA (genetic information) Copyright Cmassengale
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8 Stability and Homeostasis Stability and Homeostasis Organisms must Maintain very stable internal conditions - HOMEOSTASIS Temperature, water content, chemical content , etc. must be maintained Copyright Cmassengale
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9 Reproduction and Inheritance Reproduction and Inheritance All organisms produce new organisms like themselves REPRODUCE Organisms transmit hereditary information to their offspring INHERITANCE Copyright Cmassengale
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10 DNA DNA Genetic Information in all cells Deoxyribonucleic Acid DNA contains instructions for traits GENES Make the structures and complex chemicals necessary for life PROTEINS DNA in every body cell (SOMATIC CELLS ) is exactly alike Copyright Cmassengale
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11 Sexual Reproduction Sexual Reproduction Hereditary information from two different organisms of the same species are combined Egg and sperm zygote (fertilized egg) Zygote contains hereditary information from both parents Copyright Cmassengale
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12 Asexual Reproduction Asexual Reproduction Hereditary information from one, usually unicellular, organism that divides Resulting cells contain identical hereditary information Genetic information from single parent Copyright Cmassengale
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13 Evolution Evolution Populations of organisms change (evolve ) over generations (time) Explains how many different kinds of organisms came into existence SPECIES Explains how modern organisms are related to past organisms Copyright Cmassengale
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Explains why organisms look
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introduction to biology - Introduction to Biology...

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