Unit 2- What is Life?
genus
taxon above the species; group of closely related species.
Kingdom
taxon below the domain in modern biological classification that consists of one or more phyla.
cell
the smallest unit of life
Cell theory
theory that states all living things are made up of cells, all life functions occur within cells, and all cells come from pre-existing cells.
multicellular
A living thing that is made of two or more cells.
stimuli
Changes to an organism's environment. Can be internal or external.
compound microscope
Light microscope that uses more than one lens to enlarge an image
Prokaryotic cells
cells that do not have a well-defined nucleus and no membrane-bound organelles
bacteria
Simple unicellular organisms
reproduction
The process by which one organism makes one or more new organisms.
protista
Unicellular and are more complex than bacteria
fungi
Unicellular and multicellular and absorb food
organism
a living thing
homeostasis
an organism's ability to maintain steady internal conditions when outside conditions change
Domains
broadest taxon in modern biological classification that is larger and more inclusive than the kingdom.
Eukaryotic cells
cell that contains a nucleus and other membrane-bound organelles.
unicellular
describes a living thing that is made of only one cell
species
group of organisms that can can mate with one another to produce fertile offspring.
plantae
multicellular and make their own food
animalia
multicellular and take in their own food
Taxonomy
science of classifying organisms.
