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MICR 2420 Midterm Exam Study Guide Solutions Which of the following family of viruses have DNA genomes - ANSWER-Hepadnaviridae The single stranded negative strand RNA of a virus - ANSWER-must be converted to positive strand RNA in order to be translated into proteins The distinction between a ...

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  • November 4, 2024
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MICR 2420 Midterm Exam Study Guide

Solutions


Which of the following family of viruses have DNA genomes - ANSWER✔✔-Hepadnaviridae


The single stranded negative strand RNA of a virus - ANSWER✔✔-must be converted to positive strand

RNA in order to be translated into proteins


The distinction between a prion and a virus is that - ANSWER✔✔-A prion is a single protein molecule

whereas a virus may contain many copies of one or several proteins


The Pasteur Swan Neck flask experiment shows that - ANSWER✔✔-microorganisms are present in air

and they can contaminate a nutrient rich broth


The Koch's postulate is used to - ANSWER✔✔-determine which organism causes a particular infectious

disease


Which type of microscopy can be used to study the interior structures of a live bacteria? - ANSWER✔✔-

phase contrast


Which of the following techniques can be used to observe ribosomes within a cell - ANSWER✔✔-

Transmission electron microscopy


Which of the following microorganisms belong to the domain Archea - ANSWER✔✔-Methanogens


Which of the following structures below can be found in the cell wall of a Gram positive bacteria? -

ANSWER✔✔-teichoic acid


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An absent-minded laboratory technician forgot the ethanol wash step in his gram negative staining

procedure. As a result; - ANSWER✔✔-Both Gram positive bacteria and Gram negative bacteria are

stained purple


Which of the following contains 80S ribosomes - ANSWER✔✔-ribosomes attached to the membrane of

rough endoplasmic reticulum


Which of the following contain proteins involved in the electron transport chain? - ANSWER✔✔-bacterial

cytoplasmic membrane


Which of the following explains the mechanism of chemotaxis in bacteria? - ANSWER✔✔-If a bacterium

senses that it is moving towards a nutrient source, its flagella will rotate anti-clockwise more frequently

than clockwise


How does facilitated diffusion resemble active transport - ANSWER✔✔-membrane proteins are requires

in both processes


Which of the following best describes what happens to a bacterium when it is placed in a solution

containing a high concentration of sodium chloride - ANSWER✔✔-water will move out of cell by osmosis


__________ is the product of ancestral engulfment of a prokaryotic cell according to the theory of

endosymbiosis - ANSWER✔✔-chloroplast


Which of the following statements regarding microorganisms from the domain Archea is false? -

ANSWER✔✔-some members can cause disease in humans


Which of the following is a characteristic of fungi - ANSWER✔✔-they are heterotrophs


You grew two different bacteria, x and y, in test tube cultures without shaking. After several days you

made the following observations - ANSWER✔✔-x is an aerobe while y is a facultative anaerobe

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The conversion of nitrate (NO3-) to nitrite (NO2-) by bacteria is - ANSWER✔✔-an anaerobic process


Which of the following is true regarding the electron transport chain of Bacteria living within giant tube

worms near volcanic sea vents - ANSWER✔✔-uses sulfide as electron donor and oxygen as electron

acceptor


Which of the following is NOT an example of a mutualistic relationship between two organisms -

ANSWER✔✔-plasmodium falciparum and humans


The light organ of the hawaiian bobtail squid produces light only at night because: - ANSWER✔✔-vibrio

fisheri in the light organ only grows to a high cell density at night producing acylhomoserine lactones

above a threshold concentration


Which of the following is the first step of the biofilm formation process - ANSWER✔✔-attachment of

planktonic cells to a surface


three domains of life - ANSWER✔✔-eukaryote, bacteria, archea


Edward Jenner - ANSWER✔✔-Introduced vaccination for smallpox. Discovered you can use cowpox virus

to immunize a person. No more small pox (only small in cow pox labs)


Robert Koch - ANSWER✔✔-Specific microbes cause specific diseases. helicobacter pylorie causes

stomach ulcers, cannot be administered to animals because it will have no effect.


Viruses - ANSWER✔✔-Require a living host cell to reproduce and are therefor not included in the three

domains of life.


Kingdom Monera - Bacteria - ANSWER✔✔-Domain Bacteria


Kingdom Fungi - Fungi - ANSWER✔✔-Domain Eukarya


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