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17 Cards in this Set

  • Front
  • Back
what are the goals of science
to investigate and understand the natural world, to explain eents in the natural world, and to use those explanations to make useful predictions
what makes science different from other searches for knowledge
deals only with the natural world, collect and organize info looking for patterns and connections, and propose explanations that can be tested by examining evidence
what are the characteristics of a good hypothesis
must be testable, based on info, inference, and imagination
what is an inference
logical interpretation based on pprior knowledge or experience
what are the characteristics of a good theory
longevity, inspires new thinking/experiments, supported by evidence, able to explain large groups of observations, able to predict outcome of new experiments
what purpose does the control in an experiment serve
stays the same and is used to compare variables
what is the difference btw a manipulated variable and a responding variable

where would you find each one on a graph
manipulated: deliberately changed (rises gradually)

responding:changes in response to the manipulated (changes as the manipulated changes)
why do scientists bother to publish results
so other scientists can test their experiment
how does a hypothesis differ from a theory
hypothesis:propsed scientific explanation for a set of observations

theory:well tested explanation that unifies a broad range of observations
what are the eight characteristics that all living things share
1.made up of units (cells)
3.based on a genetic code
4.grow and develop
5.obtain/use materials/energy
6.respond to environment
7.stable internal environment
8.change over time (group)
what is homeostasis, metabolism, and evolution
homeostasis:process in which organisms keep water/temp. stable

metabolism:chemical reactions when an organism builds up/breaks down materials

evolution:ability of a group of organisms to change over time
what were the experiments or redi, spallanzani, needham, and pasteur
redi-keep flies away from meat and no maggots (meat in jar)

spallanzani-spontanious generation could occur (hotter gravy)

needham:spontaneous generation could occur under the right conditions (gravy)

pasteur-all living things come from other living things (long necked flask)
what are the levels of biological organization
biosphere, ecosystem, community, population, organism, cell groups, cells, molecules
what is the advantage of cell specialization
organisms can perform different functions
metric system

celsius temp. scale
multiples of 10
length-cm, m, mm, km
mass-g, kg, mg, t
volume-L, mL, cubic cm

temp.-0 degrees freezing point, 100 degrees boiling point
safety procedures
1.follow teachers/books directions exactly

2.wash hands after experiment
uses of the different tools (microscopes, centrifuge, cell culture)
compound light-allows light to pass through specimen, uses 2 lenses

electron-uses beams of electrons

transmission electron-shines beam of electrons through specimen, details

scanning electron- nonliving, beam of electrons back and forth, 3 dimentional

centrifuge-instrument that can spin a tupe up to 20,000 times per minute

cell culture-group is developed from a single cell