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MIC301 Exam 1 questions with 100% correct answers A+ graded
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MIC301 Exam 1 questions with 100% correct answers A+ graded
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MIC301 Exam 1 questions with 100%correct answers A+ graded
All of us are composed of approximately 30 trillion (30,000,000,000,000 or 3 x 1013) cells.
We have approximately _____ microbes living in close association with our bodies and of those microbes
approximately what percentage are located in our lower intestinal tract (i.e., the large intestine)? -
correct answer ✔✔38 trillion microbes
99% are located in the lower intestinal tract (large intestine)
Know the approximate age of the Earth, how long microbes have inhabited our planet, when
cyanobacteria started 'polluting' our planet with molecular oxygen (O2), and when multicellular
organisms first emerged. - correct answer ✔✔Earth is over 4 billion years old
Microbes have existed for approximately 3.8 billion years
All of the following statements about microbes are true EXCEPT:
a. All microbes (as biologically defined) consist of a single cell.
b. All microbes (as operationally defined) require a microscope to observe.
c. Most bacteria are approximately 10 to 20 microns (µm) in size.
d. Recently a bacterium was discovered that could be observed without magnification. - correct answer
✔✔Most bacteria are approximately 10 to 20 microns (µm) in size
Know when microbes were discovered by humans and how long after that they were shown to cause
disease leading to the 'germ theory of disease'. - correct answer ✔✔Discovered approx. 350 years ago
(1660s)
Weren't shown to cause disease until about 140 years ago. (1800s)
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