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Biology The study of Life!
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What is Biology? Biology is the study of all living things
Living things are called organisms Organisms include bacteria, protists, fungi, plants, & animals
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All Living Things Share Common Characteristics
Cells Reproduction Metabolism Homeostasis Heredity Evolution Interdependence
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Characteristics of Organisms
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All Organisms are made of Cells
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Facts About Cells Cells are the smallest living unit of an organism
All cells contain: Cytoplasm Cell Membrane DNA Ribosomes Cytoskeleton
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More Cell Facts Cells are complex & highly organized
Cells have parts called organelles that do different jobs e.g. Chloroplasts in plants make sugars
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Organisms are Grouped by their Number of Cells
Unicellular Organisms Living Organism Made Up Of One Cell Multicellular Organisms Living Organism Made Up Of Many, Specialized Cells
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Reproduction process by which organisms make more of their kind
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Sexual Reproduction Involves 2 parents
Egg fertilized by sperm to make a ZYGOTE Offspring DIFFERENT from parents
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Asexual Reproduction Involves a single organism or cell Cell divides
Offspring IDENTICAL to parent
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Metabolism Sum of all the chemical reactions in an organism
All require energy Sunlight is the ultimate energy for life on Earth
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Metabolism All living things use energy to run the process of life.
All living things use energy to grow, to move, and to process information. Examples: Photosynthesis, Cellular Respiration, Digesting food
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Homeostasis Keeping the internal environment of the cell or organism within the ranges required for life Stable internal conditions of pH, temperature, water balance, etc. Maintaining a balance
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Heredity The passing of traits from parent to offspring
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Heredity Gene is the basic unit of heredity.
DNA carries the genetic code for all organisms All organisms contain DNA
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Evolution Change over time
Groups Of Organisms (Not Individuals) Change Over Time In Order To Survive Within Changing Environments. Fossil records show changes in groups of organisms
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Interdependence organisms are dependent on one another and their environment Ecology – the study of the interactions of organisms with one another and with the non-living part of their environment
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Life is Organized on Several Levels
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Levels Atoms Molecules Organelles Cells – life starts here Tissues
Organs System Organism
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