ENVS 1126 LSU EXAM 3 STUDY GUIDE
2025/2026 ACCURATE QUESTIONS AND
VERIFIED CORRECT SOLUTIONS WITH
RATIONALES || 100% GUARANTEED PASS
<LATEST VERSION>
1. What is really old-fashioned about nuclear power? (2) What is really
cutting-edge and innovative about nuclear power? (3) What is really scary
about nuclear power? - ANSWER ✓ (1) it's just heating water to rotate a
turbine. (2) It can provide power for extremely long periods of time. (3)
There is a possibility of a meltdown that harms humans and the
environment.
2. What is the approximate half-life of U-235? - ANSWER ✓ 700 million
years
3. The concentration of U-235 needed to generate nuclear power is
approximately (1) ___, but the concentration of U-235 needed to generate
nuclear weapons is approximately (2) _____. - ANSWER ✓ (1) 4%, (2) 85%
4. What is the difference between carbon-12, carbon-13, and carbon-14? -
ANSWER ✓ - carbon-12 has an atomic mass of 12; carbon-13 has an atomic
mass of 13, carbon 14 has an atomic mass of 14
- carbon-12 has 6 protons and 6 neutrons; carbon-13 has 6 protons and
7 neutrons; carbon-14 has 6 protons and 8 neutrons
5. Answer the 3 following questions regarding isotopes: (1) does the changing
the number of neutrons change the number of protons? (2) does changing the
number of neutrons change the atomic number? (3) does the changing the
number of neutrons change the atomic mass? - ANSWER ✓ no; no; yes
6. The atomic number of oxygen is 8; this means: - ANSWER ✓ oxygen has 8
protons in its nucleus
,7. Isotopes have: - ANSWER ✓ the same atomic number but different atomic
mass
8. Radon is an odorless radioactive gas that you cannot taste or see. Exposure
to this naturally occurring gas can be dangerously high in any home in North
America. Homes must be specially tested for exposure levels for residents to
understand their risks. If risks are high, venting systems can be installed to
significantly lower indoor levels of exposure. The most likely health
problem associated with long-term exposure to this radioactive gas is: -
ANSWER ✓ lung cancer
9. Chronic obstructive pulmonary disease (COPD) is the 4th leading cause of
death in the United States. this disease primarily affects: - ANSWER ✓ the
respiratory passageways and alveoli of the lungs
10.Atmospheric scientists often measure gases in parts per million by weight
(ppm). if CO2 is currently 0.04% of the atmosphere, the level expressed in
ppm is: - ANSWER ✓ 400 ppm
11.Which one of the following generally increases natural sources of the
pollution of the air? - ANSWER ✓ gases released by a volcanic eruption
12.How might the 2011 Fukushima have potentially impacted seafood in the
United States? - ANSWER ✓ organisms in the water could have migrated
and entered the food chain in animals that migrate long distances
13.LD50 is - ANSWER ✓ The dose that it takes to kill half of a population
14.Industrial pollution from this oil refinery best represents a type of -
ANSWER ✓ Chemical environmental hazard.
15.Your grandfather found some old paint in his basement dated for 1975. He
uses it to refresh his walls and doesn't think much of it afterward. Within a
couple of months, he is suffering from memory loss, headaches, and a loss
of appetite. It turns out that there were high levels of lead present in the old
paint causing his symptoms. This instance is an example of: - ANSWER ✓
chronic exposure
,16.The H1N1 swine flu pandemic of 2009-2010 resulted in the immunization of
millions of people. When the immunizations were first available, people
under 25 or over 65 were given priority. This was done because - ANSWER
✓ These age groups were most vulnerable to the hazard, putting them at
greatest risk
17.Which statement is false about cancer? - ANSWER ✓ It cannot be caused by
second hand smoke
18.Of the 4,000+ compounds in a cigarette at least ___ are carcinogenic. -
ANSWER ✓ 40
19.In the United States, we could save more lives if we simply - ANSWER ✓
stopped smoking and reduced obesity
20.Being exposed to secondhand smoke by living with a person who smokes -
ANSWER ✓ is now known to increase the chances of cancer of everyone in
the home
21.Which is not true about cancer? - ANSWER ✓ It is the leading cause of
dead in the US
22.What is a vector? - ANSWER ✓ An organism that carries the pathogen or
parasite
23.Which one of the following choices does not qualify as human carcinogens?
- ANSWER ✓ Foods high in antioxidants
24.Which statement is not true about waterborne diseases? - ANSWER ✓ They
are mediated by a vector
25.About 6 hours after winning a raw oyster eating contest, you start
experiencing nausea, vomiting, and watery diarrhea. Because you took Dr.
Johnson's ENVS 1126 class, you immediately know that it's likely you have
been infected with ___. - ANSWER ✓ Vibrio parahaemolyticus
, 26.You arrive at school and see that some of your classmates are out sick. The
school has issued an announcement that students are coming down with a
cold but no one knows why yet. As the days go on more and more students
are getting sick. The principal decides to call in an expert to understand how
this cold is spreading. What type of expert should the principal call? -
ANSWER ✓ Epidemiologist
27.Environmental hazards and human health (A): Malaria is an example of a
biological hazard. In malaria, the relation Mosquito:human:plasmodium is
equivalent to - ANSWER ✓ vector:host:parasite
28.Environmental hazards and human health (A): You are trying to wean
yourself off Sudafed because you got a job as the Head Jelly Donut Filler at
Krispy Kreme and they frown on Sudafed use. You have lost a lot of weight
and are down to 100 pounds. Your drug test is Monday morning at 8:00 AM,
and you know that the drug test has a lower limit of detection of 10 mg of
Sudafed per 100 pounds and that Sudafed has a half life of at most 12 hours.
The last time you took Sudafed was Friday night at 8:00 PM, and it was a
dose of 0.48 grams of Sudafed. How much Sudafed was in your system by
8:00 AM Monday morning, and will you fulfill your lifelong dream as the
Head Jelly Donut Filler at Krispy Kreme? - ANSWER ✓ Bad news, you will
not get the job because by Monday morning you will have 15mg of Sudafed
in your system. You will have to go back to working at Dunkin Donuts,
which is your backup plan.
29.Environmental hazards and human health (B): What is true about a lesion? -
ANSWER ✓ it is a change in the DNA sequence that can be temporary
30.Environmental hazards and human health (B): The #1 cause of cancer-
related deaths in men is (1)___, and the #1 cause of cancer-related death in
women is (2)____. - ANSWER ✓ Lung cancer, lung cancer
31.Waterborne Human Pathogens: You eat a rare (undercooked) hamburger
from Reggie's. Two days later you have bloody diarrhea. What is the most
likely causative agent (the organism) of your bloody diarrhea? - ANSWER
✓ E. coli
32.Waterborne human pathogens: THe study of the presence, distribution, and
prevention of disease in populations is called - ANSWER ✓ Epidemology
2025/2026 ACCURATE QUESTIONS AND
VERIFIED CORRECT SOLUTIONS WITH
RATIONALES || 100% GUARANTEED PASS
<LATEST VERSION>
1. What is really old-fashioned about nuclear power? (2) What is really
cutting-edge and innovative about nuclear power? (3) What is really scary
about nuclear power? - ANSWER ✓ (1) it's just heating water to rotate a
turbine. (2) It can provide power for extremely long periods of time. (3)
There is a possibility of a meltdown that harms humans and the
environment.
2. What is the approximate half-life of U-235? - ANSWER ✓ 700 million
years
3. The concentration of U-235 needed to generate nuclear power is
approximately (1) ___, but the concentration of U-235 needed to generate
nuclear weapons is approximately (2) _____. - ANSWER ✓ (1) 4%, (2) 85%
4. What is the difference between carbon-12, carbon-13, and carbon-14? -
ANSWER ✓ - carbon-12 has an atomic mass of 12; carbon-13 has an atomic
mass of 13, carbon 14 has an atomic mass of 14
- carbon-12 has 6 protons and 6 neutrons; carbon-13 has 6 protons and
7 neutrons; carbon-14 has 6 protons and 8 neutrons
5. Answer the 3 following questions regarding isotopes: (1) does the changing
the number of neutrons change the number of protons? (2) does changing the
number of neutrons change the atomic number? (3) does the changing the
number of neutrons change the atomic mass? - ANSWER ✓ no; no; yes
6. The atomic number of oxygen is 8; this means: - ANSWER ✓ oxygen has 8
protons in its nucleus
,7. Isotopes have: - ANSWER ✓ the same atomic number but different atomic
mass
8. Radon is an odorless radioactive gas that you cannot taste or see. Exposure
to this naturally occurring gas can be dangerously high in any home in North
America. Homes must be specially tested for exposure levels for residents to
understand their risks. If risks are high, venting systems can be installed to
significantly lower indoor levels of exposure. The most likely health
problem associated with long-term exposure to this radioactive gas is: -
ANSWER ✓ lung cancer
9. Chronic obstructive pulmonary disease (COPD) is the 4th leading cause of
death in the United States. this disease primarily affects: - ANSWER ✓ the
respiratory passageways and alveoli of the lungs
10.Atmospheric scientists often measure gases in parts per million by weight
(ppm). if CO2 is currently 0.04% of the atmosphere, the level expressed in
ppm is: - ANSWER ✓ 400 ppm
11.Which one of the following generally increases natural sources of the
pollution of the air? - ANSWER ✓ gases released by a volcanic eruption
12.How might the 2011 Fukushima have potentially impacted seafood in the
United States? - ANSWER ✓ organisms in the water could have migrated
and entered the food chain in animals that migrate long distances
13.LD50 is - ANSWER ✓ The dose that it takes to kill half of a population
14.Industrial pollution from this oil refinery best represents a type of -
ANSWER ✓ Chemical environmental hazard.
15.Your grandfather found some old paint in his basement dated for 1975. He
uses it to refresh his walls and doesn't think much of it afterward. Within a
couple of months, he is suffering from memory loss, headaches, and a loss
of appetite. It turns out that there were high levels of lead present in the old
paint causing his symptoms. This instance is an example of: - ANSWER ✓
chronic exposure
,16.The H1N1 swine flu pandemic of 2009-2010 resulted in the immunization of
millions of people. When the immunizations were first available, people
under 25 or over 65 were given priority. This was done because - ANSWER
✓ These age groups were most vulnerable to the hazard, putting them at
greatest risk
17.Which statement is false about cancer? - ANSWER ✓ It cannot be caused by
second hand smoke
18.Of the 4,000+ compounds in a cigarette at least ___ are carcinogenic. -
ANSWER ✓ 40
19.In the United States, we could save more lives if we simply - ANSWER ✓
stopped smoking and reduced obesity
20.Being exposed to secondhand smoke by living with a person who smokes -
ANSWER ✓ is now known to increase the chances of cancer of everyone in
the home
21.Which is not true about cancer? - ANSWER ✓ It is the leading cause of
dead in the US
22.What is a vector? - ANSWER ✓ An organism that carries the pathogen or
parasite
23.Which one of the following choices does not qualify as human carcinogens?
- ANSWER ✓ Foods high in antioxidants
24.Which statement is not true about waterborne diseases? - ANSWER ✓ They
are mediated by a vector
25.About 6 hours after winning a raw oyster eating contest, you start
experiencing nausea, vomiting, and watery diarrhea. Because you took Dr.
Johnson's ENVS 1126 class, you immediately know that it's likely you have
been infected with ___. - ANSWER ✓ Vibrio parahaemolyticus
, 26.You arrive at school and see that some of your classmates are out sick. The
school has issued an announcement that students are coming down with a
cold but no one knows why yet. As the days go on more and more students
are getting sick. The principal decides to call in an expert to understand how
this cold is spreading. What type of expert should the principal call? -
ANSWER ✓ Epidemiologist
27.Environmental hazards and human health (A): Malaria is an example of a
biological hazard. In malaria, the relation Mosquito:human:plasmodium is
equivalent to - ANSWER ✓ vector:host:parasite
28.Environmental hazards and human health (A): You are trying to wean
yourself off Sudafed because you got a job as the Head Jelly Donut Filler at
Krispy Kreme and they frown on Sudafed use. You have lost a lot of weight
and are down to 100 pounds. Your drug test is Monday morning at 8:00 AM,
and you know that the drug test has a lower limit of detection of 10 mg of
Sudafed per 100 pounds and that Sudafed has a half life of at most 12 hours.
The last time you took Sudafed was Friday night at 8:00 PM, and it was a
dose of 0.48 grams of Sudafed. How much Sudafed was in your system by
8:00 AM Monday morning, and will you fulfill your lifelong dream as the
Head Jelly Donut Filler at Krispy Kreme? - ANSWER ✓ Bad news, you will
not get the job because by Monday morning you will have 15mg of Sudafed
in your system. You will have to go back to working at Dunkin Donuts,
which is your backup plan.
29.Environmental hazards and human health (B): What is true about a lesion? -
ANSWER ✓ it is a change in the DNA sequence that can be temporary
30.Environmental hazards and human health (B): The #1 cause of cancer-
related deaths in men is (1)___, and the #1 cause of cancer-related death in
women is (2)____. - ANSWER ✓ Lung cancer, lung cancer
31.Waterborne Human Pathogens: You eat a rare (undercooked) hamburger
from Reggie's. Two days later you have bloody diarrhea. What is the most
likely causative agent (the organism) of your bloody diarrhea? - ANSWER
✓ E. coli
32.Waterborne human pathogens: THe study of the presence, distribution, and
prevention of disease in populations is called - ANSWER ✓ Epidemology
