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MICR 2420 Midterm test questions and answers 2024.
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MICR 2420 Midterm test questions and answers 2024.
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MICR 2420 Midterm testquestions and answers 2024
Which of the following family of viruses have DNA genomes
Hepadnaviridae
The single stranded negative strand RNA of a virus
must be converted to positive strand RNA in order to be translated into
proteins
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The distinction between a prion and a virus is that
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
microorganisms are present in air and they can contaminate a nutrient
rich broth
The Koch's postulate is used to
determine which organism causes a particular infectious disease
Which type of microscopy can be used to study the interior structures of a
live bacteria?
,phase contrast
Which of the following techniques can be used to observe ribosomes
within a cell
Transmission electron microscopy
Which of the following microorganisms belong to the domain Archea
Methanogens
Which of the following structures below can be found in the cell wall of a
Gram positive bacteria?
teichoic acid
An absent-minded laboratory technician forgot the ethanol wash step in
his gram negative staining procedure. As a result;
Both Gram positive bacteria and Gram negative bacteria are stained
purple
Which of the following contains 80S ribosomes
ribosomes attached to the membrane of rough endoplasmic reticulum
Which of the following contain proteins involved in the electron transport
chain?
bacterial cytoplasmic membrane
Which of the following explains the mechanism of chemotaxis in bacteria?
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
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
water will move out of cell by osmosis
__________ is the product of ancestral engulfment of a prokaryotic cell
according to the theory of endosymbiosis
chloroplast
Which of the following statements regarding microorganisms from the
domain Archea is false?
some members can cause disease in humans
, Which of the following is a characteristic of fungi
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
x is an aerobe while y is a facultative anaerobe
The conversion of nitrate (NO3-) to nitrite (NO2-) by bacteria is
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
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
plasmodium falciparum and humans
The light organ of the hawaiian bobtail squid produces light only at night
because:
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
attachment of planktonic cells to a surface
three domains of life
eukaryote, bacteria, archea
Edward Jenner
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
Specific microbes cause specific diseases. helicobacter pylorie causes
stomach ulcers, cannot be administered to animals because it will have no
effect.
Viruses
Require a living host cell to reproduce and are therefor not included in the
three domains of life.
Kingdom Monera - Bacteria
Domain Bacteria
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