PUBLIC HEALTH Chapter 5 ACTUAL EXAM WITH COMPLETE
QUESTIONS & ACCURATE DETAILEDC ANSWERS\LATEST
UPDATE WITH COMPLETE Q&A LATEST UPDATE BEST FOR
MIDTERM EXAM 2026
The LD50for arsenic in humans is 13mg/kg. Which of the following
approaches should be used to calculate the number of grams of
arsenic it would take to reach the LD50LD50 in a 140-pound person?
[Note:
1kg=2.2pounds]
140lb×(1kg/2.2lb)×(13mg/1kg)×(1g/1,000mg)
Cholera is an acute infection of the digestive system that is caused by the
bacterium Vibrio cholerae. Infected individuals can experience a range of
symptoms, including diarrhea, vomiting, muscle cramps, low blood
pressure, rapid heart rate, and extreme thirst. If symptoms persist and severe
dehydration results, an infected individual can die within hours of symptom
onset. The diagram below shows how cholera is transmitted.
Based on the diagram, which of the following is the most likely reason that a
community with good sanitation could still have individuals who contract
cholera?
Runoff from a nearby agricultural field pollutes a reservoir used for drinking
water.
, Which of the following best explains why DDT has been found in
penguin eggs in the Antarctic?
Chemicals used in one region of Earth can circulate in the
biosphere and affect organisms in a distant region.
Researchers are evaluating the waste treatment facility
located on the Moose River in the northeastern United
States. They are sampling the river and its tributaries at
several locations, as shown on the map below.
Researchers suspect that sewage leaked into the Moose
River. Rates for which of the following diseases should be
used to determine whether the human population using
the river as a source of drinking water was exposed to
sewage?
Dysentery
,Toxicologists say, "the dose makes the poison," meaning that most
substances are harmful in high enough concentrations. The data for
anastrozole
does not support this concept because as concentration increases,
response decreases
Endocrine disruptors directly affect which of the following in an
organism?
Hormones
Which of the following best describes a way that persistent
organic pollutants (POPs) cause harm in the environment?
Persistent organic pollutants are soluble in fat, so they accumulate in
an organisms' fatty tissues.
A pesticide was applied to a population of roaches, and it was
determined that the LD50 was 55mg/kg. If the average mass of a
roach was 0.02kg, which of the following approaches will
determine the dose in mg per roach?
(55mg/1kg)×0.02kg
The activity with the health risk most likely to be overestimated by
the general public in the United States is
living near a nuclear power plant
, Which of the following is LEAST likely to be an effect of global
warming?
Decreased rate of photosynthesis in vegetation
The drop in stratospheric ozone levels in the Southern Hemisphere
(the "ozone hole") is most evident during which season?
Antarctic spring (October)
Which of the following types of releases of greenhouse gases from
an anthropogenic source is shown in the diagram?
Industrial and agricultural practices releasing CH4 (Methane) into the
atmosphere
QUESTIONS & ACCURATE DETAILEDC ANSWERS\LATEST
UPDATE WITH COMPLETE Q&A LATEST UPDATE BEST FOR
MIDTERM EXAM 2026
The LD50for arsenic in humans is 13mg/kg. Which of the following
approaches should be used to calculate the number of grams of
arsenic it would take to reach the LD50LD50 in a 140-pound person?
[Note:
1kg=2.2pounds]
140lb×(1kg/2.2lb)×(13mg/1kg)×(1g/1,000mg)
Cholera is an acute infection of the digestive system that is caused by the
bacterium Vibrio cholerae. Infected individuals can experience a range of
symptoms, including diarrhea, vomiting, muscle cramps, low blood
pressure, rapid heart rate, and extreme thirst. If symptoms persist and severe
dehydration results, an infected individual can die within hours of symptom
onset. The diagram below shows how cholera is transmitted.
Based on the diagram, which of the following is the most likely reason that a
community with good sanitation could still have individuals who contract
cholera?
Runoff from a nearby agricultural field pollutes a reservoir used for drinking
water.
, Which of the following best explains why DDT has been found in
penguin eggs in the Antarctic?
Chemicals used in one region of Earth can circulate in the
biosphere and affect organisms in a distant region.
Researchers are evaluating the waste treatment facility
located on the Moose River in the northeastern United
States. They are sampling the river and its tributaries at
several locations, as shown on the map below.
Researchers suspect that sewage leaked into the Moose
River. Rates for which of the following diseases should be
used to determine whether the human population using
the river as a source of drinking water was exposed to
sewage?
Dysentery
,Toxicologists say, "the dose makes the poison," meaning that most
substances are harmful in high enough concentrations. The data for
anastrozole
does not support this concept because as concentration increases,
response decreases
Endocrine disruptors directly affect which of the following in an
organism?
Hormones
Which of the following best describes a way that persistent
organic pollutants (POPs) cause harm in the environment?
Persistent organic pollutants are soluble in fat, so they accumulate in
an organisms' fatty tissues.
A pesticide was applied to a population of roaches, and it was
determined that the LD50 was 55mg/kg. If the average mass of a
roach was 0.02kg, which of the following approaches will
determine the dose in mg per roach?
(55mg/1kg)×0.02kg
The activity with the health risk most likely to be overestimated by
the general public in the United States is
living near a nuclear power plant
, Which of the following is LEAST likely to be an effect of global
warming?
Decreased rate of photosynthesis in vegetation
The drop in stratospheric ozone levels in the Southern Hemisphere
(the "ozone hole") is most evident during which season?
Antarctic spring (October)
Which of the following types of releases of greenhouse gases from
an anthropogenic source is shown in the diagram?
Industrial and agricultural practices releasing CH4 (Methane) into the
atmosphere
