introduction to biology
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INTRODUCTION TO BIOLOGY
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BIOLOGY Bios-: greek for life -logy: study of A biologist uses the scientific method to study
living things Biology is the study of life
Zoology Botany Microbiology Ecology Marine Biology Genetics Cell biology Anatomy and physiology Paleontology
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SO….WHAT MAKES SOMETHING “LIVING”? Made up of cells Reproduce Genetic code Growth and development Obtain and use materials (resources)
and energy Respond to their environment Maintain a stable internal environment As a group, they change over time
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MADE UP OF CELLS Cell
Collection of living matter enclosed by a barrier Smallest structural unit of all living things Prokaryotic cells
Cell without a nucleus, DNA is in cytoplasm Eukaryotic Cells
Cell with a nucleus that contains the genetic material (DNA) Unicellular
“uni-” means one Organism that is made of one cell Example: bacteria Prokaryotic cells
Multi-cellular “multi-” means many Contain hundreds, thousands, even trillions of cells Many cells work together to make the living organism function Cells vary in size, shape and function Example: plants and animals
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ABILITY TO REPRODUCE Asexual reproduction
Organism has single parent Genetically identical to parent Splits in half
Sexual reproduction Cells from two different parents unite to
form new organism Increases genetic variety and survival of
species
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BASED ON A GENETIC CODE DNA nucleic acid that carries all the
information about the organism All living organisms have DNA, the “blue
prints” of life
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GROWTH AND DEVELOPMENT Growth means increase in
size, such as certain bacteria
Development refers to cells dividing to
Includes periods of rapid growth and dramatic change
Sometimes different stages (think caterpillar)
During development, cells multiply and are assigned specific functions and roles within the multi-cellular organism…DIFFERENTIATION
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OBTAIN AND USE MATERIALS AND ENERGY
Obtain energy by taking in resources
Plants-sunlight Lizard-insects
Metabolism Combination of chemical
reactions through which an organism builds up or breaks down materials to carry out life processes
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RESPOND TO THEIR ENVIRONMENT Stimulus
A signal to which an organism responds External Stimuli
From environment outside organism Example- water in soil stimulates
germination Internal Stimuli
Comes from inside an organisms body Low sugar levels in blood will stimulate
you to feel hungry
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MAINTAIN A STABLE INTERNAL ENVIRONMENT Homeostasis When organisms maintain a stable
internal environment that is different from the external environment
Examples: shivering and sweating
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AS A GROUP, THEY CHANGE OVER TIME Evolution
Process of change When a group of organisms change over time Could occur over hundreds or millions of years
Adaptation An inherited trait that’s helps an organisms ability
to survive and reproduce in a particular environment
Over a short period of time Natural selection
The most beneficial traits for a specific group of organisms is passed on
Organisms that have that specific trait will live longer and produce more offspring than those who do not have it
The mechanism by which evolution occurs
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LEVELS OF ORGANIZATION Molecular Cellular Groups of Cells Organism Population Community Ecosystem Biosphere
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LEVELS OF ORGANIZATION
Molecular DNA/RNA and other molecules
Cellular Different cells
Groups of Cells (cellstissuesorgansorgan systemsorganism)
Organism A single species
Population A group of the same species
Community Many different groups of species and how they interact with
each other in a specific area Ecosystem
All the living and nonliving interactions in an area
Biosphere How all the different parts (biomes) of Earth come together Bio- means life Sphere- earth Life is found on land, in air, and in water “living Earth”
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Life’s Diversity of Species Plants and animals…is there only one
type? Species
A distinct life form Biologists have identified more than one
million species There are various estimates to the actual amount
New species are discovered daily 5000 sp. of bacteria, 8600 sp. of birds,
30,000 sp. of fishes, 100,000 sp. of fungi, 280,000 sp. of plants and 1 million different species of….
INSECTS
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Domains Broadest category of classification Three main domains
Domain Archea: unicellular prokary. That live in extreme environments
(very hot or very cold, extremely acidic or basic)) Domain Bacteria: All other unicellular prokary. Domain Eukarya: Organism made up of eukary. Cells
Includes 4 kingdoms: Protists, Fungi, Plants, Animals
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Classification How do we organize all these species? We categorize all the different species in to
broader categories From broadest to most specific: Domain, Kingdom, Phylum, Class, Order, Family,
Genus, Species (Linnaean System of Classification)
Binomial nomenclature BREAK UP THE WORD…
BI-TWO, NOMIAL-NAME, NOMENCLATURE-NAMING SYSTEM
This is how we identify a species The African lion is called Panthera leo
What’s the genus? Panthera
What is the species? Panthera leo (you say both genus and species)
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