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antibodies special proteins produced by our bodies in response to a disease-causing microbe.

antibiotic any substance that kills bacteria.

autotroph organism that makes its own food

bacillus rod-shaped bacteria.

bacteria single-celled prokaryote organisms with a cell membrane and cytoplasm that multiply by simple division.

bacterium a single bacterial organism.

binary fission asexual reproduction in which one cell divides into two identical cells.

biology the study of living things.
chronic disease a disease with lingering symptoms.

chemosynthesis production of food using the energy contained in inorganic molecules.

cocci sphere-shaped bacteria.

cytoplasm the protoplasm, or living material outside the nucleus of a cell.

decomposer bacteria that break down dead organic material.

epidemic outbreak of a disease in a community.

Escherichia coli (E. coli) bacterium normally found in the large intestine in humans, where it maintains health of the intestine and makes vitamin K.

immunology study of disease and the body?s response to it.

lipid bilayer cell membrane made up of two layers of fat molecules and embedded proteins.

microbes microscopic organisms: bacteria, viruses, molds, fungus, yeast.

microbiology the study of microbes.

nitrogen gas in the atmosphere that is a component of proteins.

nitrogen-fixing bacteria microbes that transform nitrogen into ammonia to aid plant growth.

pandemic disease that has spread worldwide.

pasteurization heating process in food that prevents bacterial contamination.

pathogen microbe that can cause a disease.

prokaryote cell without a nucleus.

spirillum spiral-shaped bacteria.

symbiosis a relationship between two organisms where one or both benefit.

vaccine any preparation of killed microorganisms or living weakened organisms introduced into the body to produce immunity to a specific disease by causing the formation of antibodies.