Biology Part 1

scientific study of life

living things

smallest, most basic unit of life

only a single cell

composed of many types of cells

group of similar cells

combination of two or more different tissues performing a common function

group of related organs working together

capacity to do work

all the chemical reactions that occur in a cell

process that transforms solar energy into chemical energy

maintenance of internal conditions

make another organism like itself

unit of heredity existing as alleles on the chromosome

modifications that make organisms suited to their way of life

group of inter-breeding animals

selection of organisms most fit to reproduce

descent with modification

zone of air, land and water at the surface of the earth where living organisms are found

all members of a species with a particular area

populations with an area interact with each other

all populations in an area interact with physical environment

discipline of identifying and classifying organisms according to certain rules

two-part scientific name

includes total number of species and the variablitiy of organisms genes and ecosystems

death of a species or larger taxonomic group

use creative thinking to combine isolated facts into a cohesive whole

possible explanation for a natural event

manner in which a scientist intends to conduct an experiment

during an experiment, condition that is deliberately changed

test group not exposed to experimental variable

representation of an actual object

results of an experiment

statement about whether or not results support a hypothesis

accepted explanations for how the world works

term used for theories that are generally accepted by an overwhelming number of scientists

positively charged particles

uncharged particles

very light negatively charged particles

atoms that vary in the number of neutrons they contain

anything that takes up space and has mass

substance that can not be broken down into another substance by ordinary chemical means

one or two letterss that represents an elements name

smallest particle of an element that displays properties of that element

center of an atom

sum of the number of protons and neutrons

number of protons in an atom

atoms (other than hydrogen) tend to form bonds until it has 8 electrons in outer shell

outer shell of an atom

group of atoms bonded together

molecule containing atoms of more than one element

charged atoms

ionic compounds held together by an attraction between negative and positive charged ions

two atoms share elections in order to have a complete outer shell

molecules that participate in a reaction

molecules formed by reaction

affinity for electrons in covalent bond

unequal sharing of electrons

attraction between positive hydrogen atoms in one molecule and negative oxygen atoms in another molecule