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24 Cards in this Set

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Science
organized way of using evidence to learn about the natural world; also, the body of knowledge that scientists have built up after years of using this process
Observation
use of one or more of the senses—sight, hearing, touch, smell, and sometimes taste—to gather information
Data
evidence; information gathered from observations
Inference
logical interpretation based on prior knowledge and experience
Hypothesis
possible explanation for a set of observations or possible answer to a scientific question
Spontaneous generation
hypothesis (disproven) stating that life could arise from nonliving matter
controlled experiment
a test of the effect of a single variable by changing it while keeping all other variables the same
manipulated variable
factor in an experiment that a scientist purposely changes; also known as independent variable
responding variable
factor in an experiment that a scientist wants to observe, which may change in response to the manipulated variable; also known as a dependent variable
theory
well-tested explanation that unifies a broad range of observations
biology
science that seeks to understand the living world
cell
collection of living matter enclosed by a barrier that separates the cell from its surroundings; basic unit of all forms of life
sexual reproduction
process by which cells from two different parents unite to produce the first cell of a new organism
asexual reproduction
process by which a single parent reproduces by itself
metabolism
set of chemical reactions through which an organism builds up or breaks down materials as it carries out its life processes
stimulus
a signal to which an organism responds
homeostasis
process by which organisms maintain a relatively stable internal environment
evolution
change in a kind of organism over time; process by which modern organisms have descended from ancient organisms
metric system
decimal system of measurement based on certain physical standards and scaled on multiples of 10
microscope
device that produces magnified images of structures that are too small to see with the unaided eye
compound light microscope
microscope that allows light to pass through a specimen and uses two lenses to form an image
electron microscope
microscope that forms an image by focusing beams of electrons onto a specimen
cell culture
group of cells grown in a nutrient solution from a single original cell
cell fractionation
technique in which cells are broken into pieces and the different cell parts are separated