Helicobacter pylori appears to have some connection with

Helicobacter pylori appears to have some connection with
 
  A. acid reflux disease.
  B. ulcers.
  C. dental caries.
  D. stomach cancer.
  E. ulcers AND stomach cancer

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The part of the atom that is most involved in chemical reactivity is the
 
  A. proton.
  B. neutron.
  C. electron.
  D. nucleus.

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The chronic inflammatory process involving the gums and tissues around the teeth is called
 
  A. dental caries.
  B. periodontal disease.
  C. dental plaque.
  D. root caries.

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Part of the ability of S. mutans to produce dental caries depends on its ability to
 
  A. invade plaque and dissolve the gums.
  B. convert sucrose to lactic acid.
  C. convert proteins to sugars.
  D. attach to the gums.

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The negatively charged component of the atom is the
 
  A. proton.
  B. nucleus.
  C. neutron.
  D. electron.