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3.3

vocab

TermDefinition
periods eras are subdivided into periods
epochs periods are subdivided into epochs
mass extinction the extinction of many species on Earth within a short period of time
land bridge connects two continents that were previously separated
eons the longest unit of geological time
eras eons are subdivided into eras
geographic isolation the separation of a population of organisms from the rest of its species
cell theory all living things are made of one or more cells, the cell is the smallest unit of life, and all new cells come from preexisting cells
macromolecules form by joining many small molecules together
nucleic acids macromolecules that form when long chains of molecules called nucleotides join tofether
proteins long chains of amino acid molecules
lipid large macromolecule that dose not dissolve in water
carbohydrates one sugar molecule, two sugar molecules, or a long chain of sugar molecules
cell membrane flexible covering that protects the inside of the cell from the environment outside the cell
cell wall stiff structure outside the cell membrane
cytoplasm fluid inside the cell that contains salts and other molecules
cytoskeleton a network of threadlike proteins that are joined together
organells specialized functions
nucleus part of a eukrayotic cell that directs cell activities and contains genetic information stored in DNA
chloroplasts are membrane-bound organelles that use light energy and make food--a sugar called gluecose--form water and carbon dioxide in a process known as photosynthesis
Created by: patedor8182