A the influenza virus undergoes minor changes (eantigee due to replication error

Question

A the influenza virus undergoes minor changes (eantigee due to replication errors. in H & N B. the influenza C. influenza D. E all of the above are true different viruses virus undergoes major changes (antigenic shift) in H and N when s (e.g, human, avian, pig) infect the same host cell and recombine more than 1million in the US and greater than 50 million killed worldwide in 1918. pneumonia and influenza were the number one cause of death in the US at the start of the 20 century 19. In the argument about spontaneous generation, what always was the argument of the believers against those who tried to disprove it? A. they are too small to come from other living things microbes can't have parents because they can't have sex there are no male and female microbes B. C. D. E. microbes are not multicellular the experiments against spontaneous generation altered the "vital forces" in air required for life Who is credited with first observing microorganisms? A. Robert Hooke B. Anton van Leeuwenhoek C. Robert Koch D. Louis Pasteur E. Carolus Linnacus 20. 21. Which of the following is false concerning mitochondria? A. Organelle prominent in ATP synthesis. B. Present in all cells. C. Has a circular chromosome. D. Divides by binary fission. E. Shares characteristics with bacteria from which it was derived. 22·Concerning Koch's postulates, which of the following would be a problem in application today? A. opportunistic pathogens B. mixed infections C. inability to culture in vitro D all of the above E none of the above

Explanation / Answer

19) the correct option is option (d)

20) the correct option is option (b)

21) the correct option is option (d)

22) the correct option is option (d)

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