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Intro to Biology

Biologist Anyone who uses the scientific method to study living things
DNA Molecule that stores all the information an organism needs to live and is passed onto future generations
Homestasis Relatively constant internal physical and chemical conditions
Stimulus A signal to which an organism responds (change in homeostasis)
Irritability The ability to respond to homeostasis
Sexual Genetic material comes from 2
Asexual Genetic material comes from 1
Metaboism Total sum of all chemical reactions that take place in an organism
Anabolism Putting together complex substances from simpler ones
Catabolism Breakdown of complex substances into simpler ones, usually with a release of energy
Structure What is it made of
Function Why does it help it to do what it does (purpose)
Tomas Malthus Humans are overcrowding the planet, only forces keeping us in check are war, famine, disease, if the population keeps growing it is unsustainable
Breeder in agriculture Selective breeding (artificial selection)
Struggle for existence Organisms must compete to obtain food, living space, and needs
Adaptions heritable characteristics that increase an organisms ability to survive and reproduce in its enviornment
Survival of the fittest differences in adaptations affect an individuals fitness
Fitness Describes how well an organism can survive and reproduce in its environment
Survival Means reproducing and passing adaptations to the next generation
Biogeography study of where organisms live now and where ancestors lived in the past
Fossil record explains why organisms that lived long ago are different from the ones we see today
Homologous structures structures shared by related species that have been shared by a common ancestor
Vestigial structures inheited from ancestors but have lost most or all of their original function due to different selection pressures
Embryology similar patterns of embryological development
Genetics and Molecular Biology common code of DNA and RNA , common genes and close DNA sequences
Characteristics of life Is based on a universal code (DNA) , grows and develops , responds to their environment , can reproduce , obtain and use energy , made up of cells , evolve
Created by: 21stewart.sam