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Question
Treatment of drinking water by UV irradiation is effective at ________, but it does NOT remove ________.A) killing bacteria and eukaryotic pathogens / odor- and taste- altering organic compounds
B) killing viruses / bacteria and eukaryotic pathogens
C) removing order- and taste- altering organic compounds / viruses
D) killing bacteria / viruses and eukaryotic pathogens
Answer
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A) gonorrhea.
B) influenza.
C) hepatitis.
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A) Staphylococcus aureus
B) Escherichia coli O157:H7
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Which of the following statements about chlamydial infections is TRUE?
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The Spanish flu of 1918 was caused by an ________ influenza virus.
A) H2N1
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Diseases can be controlled through immunization even if the percentage of the population that is immunized is less than 100% because
A) vectors can be controlled through other means.
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In just over a decade of efforts, the World Health Organization (WHO) eradicated smallpox by using worldwide
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In 2003, the majority of AIDS deaths occurred in
A) South America.
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C) Europe.
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The study of the occurrence, distribution, and determinants of health and disease in a population is the field of
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B) prevalence / mortality
C) mortality / morbidity
D) morbidity / mortality
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Cholera is an example of a pandemic disease that
A) has multiple wild animal reservoirs and is thus difficult to eradicate.
B) spreads from a common source and could be controlled with adequate clean water and waste sanitation measures.
C) is spread through direct contact and has only a human reservoir.
D) has recently emerged due to overcrowding in urban centers.
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Influenza pandemics occur cyclically because
A) less than 100% of the population is immunized.
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A) clonal anergy
B) clonal deletion
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B) high energy.
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Q:
An individual usually expresses ________ structurally distinct allele(s) that encode class I MHC proteins.
A) one
B) two
C) four
D) six