What is the cause of most peptic ulcers?
a. lactose intolerance
b. heartburn
c. bacteria
d. malnutrition
Ans: c. bacteria
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Which of the following microbial groups have members which are considered to be autotrophic?
a. fungi b. protists c. prions d. viruses e. All of the above
Which of the following hormones counteract each other in regulating calcium homeostasis?
A. antidiurectic hormone and aldosterone B. atrial natriuretic peptide and aldosterone C. parathyroid hormone and vitamin D (1,25 dihydroxyvitamin D) D. antidiurectic hormone and parathyroid hormone E. antidiurectic hormone and vitamin D (1,25 dihydroxyvitamin D)
Which layer of the eye contains an extensive blood supply?
A. lens B. sclera C. choroid D. cornea E. retina
An example of an "emerging virus" (a virus in a new host) with a lethality rate in excess of 50% is
A. influenza virus. B. Ebola virus. C. yellow fever. D. hepatitis B. E. variola virus.