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