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Grade 7 Ch 2 Viruses

Ch 2 Viruses and Bacteria

virus a small, nonliving particle that invades and then reproduces inside a living cell
host a living thing the provides a source of energy for a virus or organism
parasite organism that live on or in a host and cause harm to the host
bacteriophage a virus that infects bacteria
nanometer one billionth of a meter
gene therapy using a virus as a messenger service to deliver genetic material to a cell that needs it
prokaryotes cells whose genetic material is not in a nucleus
cytoplasm a gel-like material in a cell
ribosomes chemical factories where proteins are produced
flagellum a long whip-like structure that extends out through the cell membrane and cell wall; used for movement
binary fission a process in which one cell divides to form two identical cells
asexual reproduction one parent reproduces to produce offspring that are identical to the parent
sexual reproduction two parents combine their genetic material to produce a new organism which differs from both parents
conjugation one bacterium transfers some of its genetic material to another bacteria through a threadlike bridge that joins the two cells
respiration the process of breaking down food to release its energy
endospore a small, rounded, thick-walled resting cell that forms inside a bacterial cell
decomposers organisms that break down large chemicals in dead organisms into small chemicals
infectious diseases illnesses that pass from one organism to another
direct contact touching, hugging, kissing another person
indirect contact inhaling the tiny drops of moisture that a person sneezes or coughs into the air
contaminated object eating utensils, food or water that have been used by an infected person
toxin a poisonous substance
antibiotics medications that can kill bacteria
Created by: Dcoleman



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