ESTUDYR
NATS 1670 FINAL EXAM UPDATED WITH MOST TESTED
QUESTIONS AND ANSWERS | GRADED A+ | ASSURED SUCCESS
WITH DETAILED RATIONALES
Infectious Diseases, Microbes & Cell Biology – Exam Style Q&A
1. What was the average life expectancy in the early 1900s?
a) Over 75 years
b) Around 65 years
c) Under 50 years, with a 25% child mortality rate
d) Exactly 55 years
✅Answer: c) Under 50 years, with a 25% child mortality rate
✅Rationale: Due to poor sanitation, infectious diseases, and lack of medical advancements, people lived
much shorter lives, and child mortality was extremely high.
2. When was the first vaccine created?
a) 1720
b) 1880
c) 1901
d) 1945
✅Answer: b) 1880
✅Rationale: Louis Pasteur developed early vaccines in the 1880s, including for rabies and anthrax,
marking the beginning of immunology.
3. ___________ ____________ can reduce life expectancy dramatically, due to the lack of
__________________.
a) Cancer; treatment
b) Accidents; prevention
c) Infectious diseases; control
d) Malnutrition; food supply
,ESTUDYR
✅Answer: c) Infectious diseases; control
✅Rationale: Before antibiotics, vaccines, and sanitation, infectious diseases killed millions because they
could not be controlled.
4. Upon early discovery, microbes were viewed as:
a) Friends
b) Enemies until their medical uses were discovered
c) Symbiotic partners
d) Harmless organisms
✅Answer: b) Enemies until their medical uses were discovered
✅Rationale: Initially, microbes were only associated with disease, but later research showed beneficial
applications in medicine, food, and biotechnology.
5. Which of the following is NOT a beneficial role of microbes?
a) Waste breakdown
b) Causing epidemics
c) Producing vitamins
d) Assisting digestion
✅Answer: b) Causing epidemics
✅Rationale: While microbes can cause disease, their beneficial roles include digestion, vitamin
production, and biotechnology.
6. What does "mutual life" mean when discussing microbes?
a) Humans kill microbes
b) Microbes kill humans
c) Microbes and humans keep each other alive
d) Microbes depend only on the environment
✅Answer: c) Microbes and humans keep each other alive
✅Rationale: Symbiotic relationships allow humans to benefit from microbes (digestion, immunity) while
microbes gain nutrients and shelter.
7. What is a chronic disease?
,ESTUDYR
a) A disease that does not kill its host quickly
b) A disease that kills within days
c) A disease with no symptoms
d) A disease caused only by viruses
✅Answer: a) A disease that does not kill its host quickly
✅Rationale: Chronic diseases persist over time and may be long-lasting without causing immediate
death.
8. What is an acute disease?
a) A long-term illness
b) A disease that causes death or symptoms quickly
c) A genetic disorder
d) A disease only found in children
✅Answer: b) A disease that causes death or symptoms quickly
✅Rationale: Acute diseases develop rapidly and may be fatal, unlike chronic conditions.
9. What does microbial evolution naturally operate on?
a) Its ability to cause severe disease
b) Its spreading capacity
c) Its resistance to vaccines
d) Its ability to mutate into cancer
✅Answer: b) Its spreading capacity
✅Rationale: Microbes evolve based on transmission efficiency, not necessarily lethality. Less lethal
microbes often spread more effectively.
10. Microbial natural selection favors:
a) Virulent microbes only
b) Less virulent or non-violent microbes
c) Only bacterial species
d) Antibiotic-resistant microbes exclusively
✅Answer: b) Less virulent or non-violent microbes
✅Rationale: If a microbe kills its host too quickly, it cannot spread efficiently. Evolution often favors less
harmful strains.
, ESTUDYR
11. Which microbes can live in a host without causing damage?
a) Highly virulent microbes
b) Well-adapted microbes
c) Opportunistic pathogens only
d) Mutated strains
✅Answer: b) Well-adapted microbes
✅Rationale: Microbes that adapt to the host environment can coexist without causing disease.
12. Which of the following epidemics were caused by microbes?
a) Smallpox
b) Bubonic plague
c) Spanish influenza
d) All of the above
✅Answer: d) All of the above
✅Rationale: Microbes have caused some of history’s deadliest epidemics, shaping human history.
13. What three factors moved society away from infectious diseases?
a) Better genetics, clean water, more doctors
b) Sanitation, vaccines, antibiotics
c) Education, nutrition, exercise
d) War prevention, safer jobs, rural living
✅Answer: b) Sanitation, vaccines, antibiotics
✅Rationale: These three public health measures dramatically reduced infectious disease mortality in the
20th century.
14. Why will society never be free from infectious diseases?
a) Lack of doctors
b) Pollution
c) Drug-resistant strains, outbreaks, and new agents
d) Weak immune systems in children
NATS 1670 FINAL EXAM UPDATED WITH MOST TESTED
QUESTIONS AND ANSWERS | GRADED A+ | ASSURED SUCCESS
WITH DETAILED RATIONALES
Infectious Diseases, Microbes & Cell Biology – Exam Style Q&A
1. What was the average life expectancy in the early 1900s?
a) Over 75 years
b) Around 65 years
c) Under 50 years, with a 25% child mortality rate
d) Exactly 55 years
✅Answer: c) Under 50 years, with a 25% child mortality rate
✅Rationale: Due to poor sanitation, infectious diseases, and lack of medical advancements, people lived
much shorter lives, and child mortality was extremely high.
2. When was the first vaccine created?
a) 1720
b) 1880
c) 1901
d) 1945
✅Answer: b) 1880
✅Rationale: Louis Pasteur developed early vaccines in the 1880s, including for rabies and anthrax,
marking the beginning of immunology.
3. ___________ ____________ can reduce life expectancy dramatically, due to the lack of
__________________.
a) Cancer; treatment
b) Accidents; prevention
c) Infectious diseases; control
d) Malnutrition; food supply
,ESTUDYR
✅Answer: c) Infectious diseases; control
✅Rationale: Before antibiotics, vaccines, and sanitation, infectious diseases killed millions because they
could not be controlled.
4. Upon early discovery, microbes were viewed as:
a) Friends
b) Enemies until their medical uses were discovered
c) Symbiotic partners
d) Harmless organisms
✅Answer: b) Enemies until their medical uses were discovered
✅Rationale: Initially, microbes were only associated with disease, but later research showed beneficial
applications in medicine, food, and biotechnology.
5. Which of the following is NOT a beneficial role of microbes?
a) Waste breakdown
b) Causing epidemics
c) Producing vitamins
d) Assisting digestion
✅Answer: b) Causing epidemics
✅Rationale: While microbes can cause disease, their beneficial roles include digestion, vitamin
production, and biotechnology.
6. What does "mutual life" mean when discussing microbes?
a) Humans kill microbes
b) Microbes kill humans
c) Microbes and humans keep each other alive
d) Microbes depend only on the environment
✅Answer: c) Microbes and humans keep each other alive
✅Rationale: Symbiotic relationships allow humans to benefit from microbes (digestion, immunity) while
microbes gain nutrients and shelter.
7. What is a chronic disease?
,ESTUDYR
a) A disease that does not kill its host quickly
b) A disease that kills within days
c) A disease with no symptoms
d) A disease caused only by viruses
✅Answer: a) A disease that does not kill its host quickly
✅Rationale: Chronic diseases persist over time and may be long-lasting without causing immediate
death.
8. What is an acute disease?
a) A long-term illness
b) A disease that causes death or symptoms quickly
c) A genetic disorder
d) A disease only found in children
✅Answer: b) A disease that causes death or symptoms quickly
✅Rationale: Acute diseases develop rapidly and may be fatal, unlike chronic conditions.
9. What does microbial evolution naturally operate on?
a) Its ability to cause severe disease
b) Its spreading capacity
c) Its resistance to vaccines
d) Its ability to mutate into cancer
✅Answer: b) Its spreading capacity
✅Rationale: Microbes evolve based on transmission efficiency, not necessarily lethality. Less lethal
microbes often spread more effectively.
10. Microbial natural selection favors:
a) Virulent microbes only
b) Less virulent or non-violent microbes
c) Only bacterial species
d) Antibiotic-resistant microbes exclusively
✅Answer: b) Less virulent or non-violent microbes
✅Rationale: If a microbe kills its host too quickly, it cannot spread efficiently. Evolution often favors less
harmful strains.
, ESTUDYR
11. Which microbes can live in a host without causing damage?
a) Highly virulent microbes
b) Well-adapted microbes
c) Opportunistic pathogens only
d) Mutated strains
✅Answer: b) Well-adapted microbes
✅Rationale: Microbes that adapt to the host environment can coexist without causing disease.
12. Which of the following epidemics were caused by microbes?
a) Smallpox
b) Bubonic plague
c) Spanish influenza
d) All of the above
✅Answer: d) All of the above
✅Rationale: Microbes have caused some of history’s deadliest epidemics, shaping human history.
13. What three factors moved society away from infectious diseases?
a) Better genetics, clean water, more doctors
b) Sanitation, vaccines, antibiotics
c) Education, nutrition, exercise
d) War prevention, safer jobs, rural living
✅Answer: b) Sanitation, vaccines, antibiotics
✅Rationale: These three public health measures dramatically reduced infectious disease mortality in the
20th century.
14. Why will society never be free from infectious diseases?
a) Lack of doctors
b) Pollution
c) Drug-resistant strains, outbreaks, and new agents
d) Weak immune systems in children
