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The nature of life
chapter one
31
Biology
9th Grade
10/08/2008

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Term
What is science?
Definition
The goal of science is to investigate and understand the natural world, to explain events in the natural world, and to use those explanations to make useful predictions.
Term
science
Definition
is an organized way of using evidence to learn about the natural world.
Term
Observation
Definition
The process of gathering information about events or processes in a careful, orderly way.
Term
data
Definition
The information gathered from observations.
Term
Inference
Definition
a logical interpretation based on prior knowledge or experience.
Term
hypothesis
Definition
a proposed scientific explanation for a set of observations.
Term
what is the goal of science?
Definition
to investigate and understand nature.
Term
how do scientists test a hypothesis? aka. controlled experiment.
Definition
by only changing one variable at a time, the others should remained unchanged.
Term
Spontaneous generation
Definition
the idea that life could arise from nonliving matter.
Term
manipulated variable
Definition
the type of experiment that is deliberately changed.
Term
responding variable
Definition
the variable that changes in response to the manipulated variable.
Term
theory
Definition
a well supported hypothesis
Term
biology
Definition
the science that seeks to understand the living world.
Term
characteristics of a living things-
Definition
-made up of units called cells.
-reproduce
-are based on a universal genetic code
-grow and develop
-obtain and use materials and energy
-respond to there environment
-maintain stable internal environment
Term
sexual reproduction
Definition
cells from two different parents produce the cell of a new organism.
Term
asexual reproduction
Definition
the new organism has a single parent.
Term
cell
Definition
a collection of living matter enclosed barrier
Term
metabolism
Definition
the combination of chemical reactions though which an organism builds up or breaks down materials as it carries out its life process
Term
stimulus
Definition
a signal to which an organism responds.
Term
homeostasis
Definition
the process where organisms must keep internal conditions, such as temperature and water content.
Term
evolution
Definition
the ability of a group if organisms to change overtime.
Term
Biosphere
Definition
the part of the earth that contains all ecosystems
Term
ecosystem
Definition
community and its non living surroundings
Term
population
Definition
group of organisms of one type that live in the same area
Term
community
Definition
populations that live together in a defined area
Term
organism
Definition
individual living thing
Term
groups of cells
Definition
tissue, organs, and organ systems
Term
molecules
Definition
groups of atoms; smallest unit of most chemical compounds
Term
metric system
Definition
a decimal system of measurement whose units are based on certain physical standers and are scaled on multiples of 10
Term
cell culture
Definition
when the cell is able to reproduce making a group of cells
Term
cell fractionation
Definition
separating the different cells
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