Inserting a gene from the hepatitis B virus into yeast so that the yeast produces a viral protein is ...

Inserting a gene from the hepatitis B virus into yeast so that the yeast produces a viral protein is an example of
 
  A) etiology.
  B) genetic engineering.
  C) immunology.
  D) microbial genetics.
  E) gene therapy.

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Which of the following types of microbe was NOT observed by Leeuwenhoek?
 
  A) fungus
  B) protozoan
  C) prokaryote
  D) alga
  E) virus

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All of the following individuals were involved in improving public health in the 19th century EXCEPT
 
  A) Snow.
  B) Spallanzani.
  C) Nightingale.
  D) Semmelweis.
  E) Lister.

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The first true vaccine protected against disease caused by a(n) ________ pathogen.
 
  A) bacterial
  B) protozoal
  C) fungal
  D) viral
  E) archaeal

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Which of the following is NOT a characteristic of viruses?
 
  A) They are visible with a light microscope.
  B) They are acellular.
  C) They are composed of genetic material and protein.
  D) They are typically smaller than prokaryotic cells.
  E) They are obligatory parasites.