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12. Some bacteria can survive extended periods of very harsh conditions by forming a. plasmids b. flagella c. pili d. endospores 13. The only chemical that interferes with virus activity is Interferon. a. true b. false 14. Gene-less organisms that infect brain cells in Alzheimer's disease is called a. viroids b. viruses c. bacteria d prions 15. Bacteriophages are a. bacteria that infect human cells b. viruses that infect human cells C viruses that infect bacteria d. all of the above