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21 Cards in this Set
- Front
- Back
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What are the characteristics of life?
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a.organized structure made up of organic molecules
b.they respond to stimuli c.they maintain homeostasis d.they take in food e.they grow f.they reproduce g.they change h.they give off waste i.they die |
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what elements are in salt?
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sodium, chlorine
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what is an atom?
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smallest particle of an element
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what are subatomic particles?
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proton [positive]
neutron [neutral] electron [negative] |
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what is a molecule?
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group of atoms bonded together
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what is a cell?
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the smallest unit of life, basic unit of structure and function of all living things.
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what does the plasma membrane do?
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surrounds the cell, and controls what goes into and out of the cell
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what are the levels of organization?
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a. subatomic particle
b. atom c. molecule d. organelle e. cell f. tissue g. organ h. organ system i. multicellular organism j. population species k. community l. ecosystem m. biosphere |
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what is responsiveness?
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when a living thing perceives a stimulus and responds to it
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what is homeostasis?
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maintaining a constant internal environment or balance in living things
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what are nutrients?
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atoms and molecules a living thing requires
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what is metabolism?
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all the chemical reactions needed to sustain life
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what is growth?
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taking in of molecules and converting them into molecules of a living thing
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what is DNA?
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molecule that contains hereditary information and serves as a blueprint for construction and operation of a living thing.
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what is mutation?
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sudden change in genetic information and results in variation in the population
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what does evolve mean?
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slow, gradual change in a population requires inheritance, mutation, and natural selection
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what is natural selection?
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those organisms best adapted to the environment survive and reproduce "survival of the fittest"
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what is the method of classification of living based on?
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-type of cell
-number of cells -type of energy acquisition |
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what are the 2 types of cells?
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-eukaryotes [large, have a true nucleus, have membrane bound organelles]
-prokaryotes [small,no nucleus, no membrane bound organelles] |
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what are the methods of acquiring energy?
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-autotrophs [producers]
use photosynthesis or chemosynthesis to make their own food -heterotroph [consumers] do not use photosynthesis or chemosynthesis but obtain nutrition from another source |
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what does the scientific method consist of?
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observation, hypothesis, experiment, conclusion
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