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24 terms

Chapter 1

STUDY
PLAY
Science
Organized way of using evidence to learn about the natural world; also, the body of knowledge that scientist 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 explaination for a set of observations or possible awnser to a scientific question.
Spontaneous Generation
Hypothesis 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 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 the understanding of 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.
Evolution
Change in a kind o fan organism over time; process by which modern organisms have descended from ancient organisms.
Homeostasis
Process by which organisms maintain a relatively stable internal environment.
Metric System
Decimal system of measurement based on certain physical standards and scaled on multiples of 10.
Microscope
Device that prodices 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.