acquired immunodeficiency syndrome (AIDS),
capsid,
capsule,
chemolithotroph,
chemoorganotroph,
conjugation,
extremophile,
Gram stain,
host,
human immunodeficiency virus (HIV),
microbe,
Oxygen Revolution,
parasite,
pathogenic,
peptidoglycan,
phagocytosis,
photoautotroph,
plasmid,
probiotic therapy,
retrovirus,
sexually transmitted disease (STD),
transduction,
transformation,
Colored transmission electron micrograph showing bacteriophage viruses that infect bacteria from the genus Listeria. Some food-
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