Chapter 1 Flashcards
use of one or more of the senses- sight, hearing, touch, smell, and sometimes taste to gather information
observation
evidence - information gathered from observations
data
well - tested explanations that unifies a broad range of observations
theory
device that produces magnified images of structures that are too small to the human eye
microscope
possible explanation for a set of observations or possible answer to a scientific question
hypothesis
hypothesis stating that life could arise from non living matter
spontaneous generation
factor in an experiment that changes - independent variable
manipulated variable
collection of living matter enclosed by a barrier that separates the cell form its surroundings - basic unit of all forms of life
cell
factor in an experiment that a scientists wants to observe, may change in response to the manipulated variable - dependent variable
responding variable
test of the effect of a single variable changing it while keeping all other variables the same
controlled experiment
science that seeks to understand the living world
biology
microscope that allows light to pass through a specimen and uses two lenses to form an image
compound light microscope
set of chemical reactions through which an organism builds up or breaks down materials as it carries out its life processes
metabolism
group of cells grown in a nutrient solution from a single original cell
cell culture
what are the goals of science
to investigate and understand the natural world, to explain events in the natural world, and to use those explanations to make useful predictions
what is the difference between observation and inference?
inference - logical interpretation based on prior knowledge. you can infer this
observation - is something you can see going on
how is a hypothesis different than a theory?
a hypothesis is a guess
a theory is a well- supported hypothesis
why is it important for scientists to share their work?
so other scientists can base their things off it, and so they will have something to go by
7 characteristics of all living things
living things are mad up o units called cells.
living things reproduce.
living things are based on a universal genetic code.
living things grow and develop.
living things obtain and use materials and energy.
living things respond to their environment.
living things maintain a stable internal environment.
taken as a group, living things change over time.
organized way of using evidence to learn about the natural world, body of knowledge
science
why do scientists only change one variable at a time
so they can determine whats causing the change
how to find the atomic number
you subtract the atomic number from the atomic mass
