micro lesson 1
Who is credited with producing the strongest early microscope?
Antonie van Leeuwenhoek
The use of ________________ on various types of HIV patients has allowed for optimization of treatment.
DNA sequencing
Which of the following correctly explains how archaea differ from bacteria and eukaryotes?
No archaea are currently known to be capable of pathogenesis.
Which of the following is a potential problem with satisfying Koch's third postulate in practice?
Some disease-causing microorganisms only cause infection in humans, so no animal models are available.
What is a microbe?
a living organism that requires a microscope to be seen
Which of the following is not a eukaryote?
archaea
Environments free of microorganisms are known as ________ environments.
aseptic
According to the endosymbiotic origin of eukaryotic cells, the ancestor of the chloroplast is a
photosynthetic bacterium
0.1%
About ________ of all microbial species can be cultured in the laboratory
Throughout history, more soldiers have died from ________ than anything else
microbial infections
Consider the case of Lyme disease, caused by the bacterium Borrelia burgdorferi, and Koch's postulates. Regarding B. burgdorferi, what would have to occur in order to satisfy Koch's second postulate?
It would have to be isolated from a host suffering from Lyme disease and grown in pure culture.
Which of the following organisms is an exception to the definition of a microbe?
Pelomyxa ameba
Who was the first individual to observe cells?
Robert Hooke
ll of the following statements explain how viruses differ from the three domains of life EXCEPT: a. Viruses are noncellular microbes. b. Viruses take over the metabolism of a host cell to generate more viral particles. c. Viruses are very small compared to the three domains of life. Correctd. Viruses contain genetic material.
d. Viruses contain genetic material
The structure of DNA was discovered using
d. X-ray crystallography
Bacteria that fix nitrogen can sometimes live as ________ inside plant cells.
endosymbionts
The process by which microbes gain energy by converting sugars to alcohol is known as
fermentation
In addition to her work as a famous nurse, Florence Nightingale also contributed to the field of microbiology by
founding the science of medical statistics.
Which of the following was NOT used to develop the germ theory of disease?
spontaneous generation
Which of the following is an example of an enrichment culture?
use of MacConkey agar, a medium selective for Gram-negative organisms such as E. coli that prevents Gram-positive organisms from growing
