1
Micro 231 exam 1 (topics 1-4) Questions with
Correct Answers | Updated (100% Correct
Answers)
how long have prokaryotes been present on earth Answer: 3.8
billion years
what type of prokaryotes left fossil remains in some soft shale rocks
that are about 3.5 billion years old Answer: cyanobacteria
When was the existence of microbes first noted by humans using a
microscope Answer: 1600s Hooke
before microscopes, what processes were humans aware of that
were caused by microbes Answer: decay, fermentation
what is the plague, what is it caused by, why is it considered to
have had a major effect on human history Answer: bubonic plague,
caused by bacterium Yersinia pestis, killed about 25% of Europe's
population
what type of microbes did Hooke observe and describe Answer:
bacteria, protozoans, yeast
what did Hooke use to observe the microbes Answer: glass lens,
small microscope
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,2
what infectious disease did Semmelweis try to control or eradicate
in the hospital facilities he had authority over, what method did he
use Answer: childbed fever, hand washing
which bacterium is now known to have been the cause of childbed
fever Answer: streptococcus
what infectious disease did John Snow try to control or eradicate
from the area of London Answer: cholera
what method did John Snow use to try to eradicate cholera Answer:
epidemiology, remove handle from water pump
what is the scientific name of the pathogenic bacterium that causes
cholera Answer: vibrio cholerae
what area of study in the public field of health microbiology did this
work by Snow help to establish Answer: epidemiology
what infectious disease did Jenner try to control or eradicate in the
area of London Answer: small pox
what type of microbes cause small pox Answer: variola virus
what method did Jenner use to attempt disease control Answer:
cowpox lesion
© 2025 All rights reserved
, 3
what were the major experiments that Pasteur carried out which led
tot major discoveries in microbiology Answer: fermentation,
spontaneous generation, silk worm disease, rabies vaccine
fermentation Answer: experiment to find out why beer sours, heat
prevents growth
spontaneous generation Answer: can something arise from nothing,
airborne microbes
silkworm Answer: verify certain microorganisms cause certain
disease, protozoa
rabies Answer: experiment if vaccines work
what were the major techniques that Koch and his coworkers
devised to enable them to study microorganisms, especially some
cultural bacteria Answer: staining techniques, isolating colonies,
streaking
What are Koch's postulates Answer: 1. The same pathogen must be
present in every case of the disease.
2. The pathogen must be isolated from the diseased host and
grown in pure culture.
3. The pathogen from the pure culture must cause the disease when
it is inoculated into a healthy, susceptible laboratory animal.
© 2025 All rights reserved
Micro 231 exam 1 (topics 1-4) Questions with
Correct Answers | Updated (100% Correct
Answers)
how long have prokaryotes been present on earth Answer: 3.8
billion years
what type of prokaryotes left fossil remains in some soft shale rocks
that are about 3.5 billion years old Answer: cyanobacteria
When was the existence of microbes first noted by humans using a
microscope Answer: 1600s Hooke
before microscopes, what processes were humans aware of that
were caused by microbes Answer: decay, fermentation
what is the plague, what is it caused by, why is it considered to
have had a major effect on human history Answer: bubonic plague,
caused by bacterium Yersinia pestis, killed about 25% of Europe's
population
what type of microbes did Hooke observe and describe Answer:
bacteria, protozoans, yeast
what did Hooke use to observe the microbes Answer: glass lens,
small microscope
© 2025 All rights reserved
,2
what infectious disease did Semmelweis try to control or eradicate
in the hospital facilities he had authority over, what method did he
use Answer: childbed fever, hand washing
which bacterium is now known to have been the cause of childbed
fever Answer: streptococcus
what infectious disease did John Snow try to control or eradicate
from the area of London Answer: cholera
what method did John Snow use to try to eradicate cholera Answer:
epidemiology, remove handle from water pump
what is the scientific name of the pathogenic bacterium that causes
cholera Answer: vibrio cholerae
what area of study in the public field of health microbiology did this
work by Snow help to establish Answer: epidemiology
what infectious disease did Jenner try to control or eradicate in the
area of London Answer: small pox
what type of microbes cause small pox Answer: variola virus
what method did Jenner use to attempt disease control Answer:
cowpox lesion
© 2025 All rights reserved
, 3
what were the major experiments that Pasteur carried out which led
tot major discoveries in microbiology Answer: fermentation,
spontaneous generation, silk worm disease, rabies vaccine
fermentation Answer: experiment to find out why beer sours, heat
prevents growth
spontaneous generation Answer: can something arise from nothing,
airborne microbes
silkworm Answer: verify certain microorganisms cause certain
disease, protozoa
rabies Answer: experiment if vaccines work
what were the major techniques that Koch and his coworkers
devised to enable them to study microorganisms, especially some
cultural bacteria Answer: staining techniques, isolating colonies,
streaking
What are Koch's postulates Answer: 1. The same pathogen must be
present in every case of the disease.
2. The pathogen must be isolated from the diseased host and
grown in pure culture.
3. The pathogen from the pure culture must cause the disease when
it is inoculated into a healthy, susceptible laboratory animal.
© 2025 All rights reserved
