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VM 500- Quiz Questions
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VM 500- Quiz Questions
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VM 500- Quiz QuestionsYou start a broth culture of a bacterium with 1000 bacteria per ml of broth. If the generation
time for this bacterium under these growth conditions is 30 minutes, how long will it take to
produce ~1 million bacteria per ml? - correct answer-5 hours
Functions of the bacterial cell membrane include all of the following except: - correct
answer-Answer: synthesis of ribonucleic acid
Actual Functions:
1) generation of energy by electron transport coupled to oxidative phosphorylation
2) secretion of enzymes and toxins
3) transport of precursors of cell wall polymers to the cell surface
4)transport of nutrients into the cell
Which of the following is the correct way to write the scientific name of this organism? -
correct answer-(Italicized)
Escherichia coli
The area between the outer membrane and the cytoplasmic membrane in Gram negative
cells is termed the - correct answer-Periplasmic space
A bacterium that possesses both catalase and superoxide dismutase and can generate
energy by either respiration or fermentation is: - correct answer-facultative anaerobe
Examine the attached photomicrograph. What is the cell shape, arrangement, and Gram
stain reaction of the microorganism shown?
purple Circles linked in a row - correct answer-Cocci in chains, Gram positive
Which of the following comparisons of prokaryotic and eukaryotic nuclear structure and
function is valid? - correct answer-In prokaryotic cells, transcription is frequently coupled with
translation; in eukaryotic cells it is not
In comparison to eukaryotic cells, prokaryotic cells: - correct answer-perform protein
synthesis on smaller (70S) ribosomes.
The structure or macromolecule on the surface of a Gram negative bacterial cell that
provides motility is the: - correct answer-Flagellum
mRNA must be transported through the nuclear membrane prior to translation in: - correct
answer-fungi
Animal cells have no cell wall. Plant cells have walls made of cellulose. Bacterial cell walls
contain what key macromolecule? - correct answer-Peptidoglycan
, Many species in the genus Lactobacillus are unable to synthesize the essential vitamin
riboflavin. In this instance, riboflavin is considered a for these species. - correct
answer-Essential metabolite
A unique macromolecule found in Gram positive bacteria but not Gram negative bacteria is: -
correct answer-teichoic acid
The transfer of phosphate from a phosphorylated substrate to ADP to form ATP is: - correct
answer-Substrate level phosphorylation
N-acetylglucosamine - N-acetylmuramic acid - pentapeptide building blocks are transported
through the cell membrane: - correct answer-Attached to bactoprenol carrier lipid molecules
In eukaryotic cells, mitochondria are the location of respiration; in prokaryotic cells capable
of respiration, this process occurs in the: - correct answer-cytoplasmic membrane
The region of the lipopolysaccharide molecule that is hydrophilic, non-toxic, and highly
antigenic is the: - correct answer-O antigen repeating oligosaccharide
Small molecules such as water, oxygen, and carbon dioxide generally enter the bacterial cell
via: - correct answer-Simple diffusion
Most bacterial pathogens and commensals of mammals utilize: - correct answer-oxidation of
organic compounds as an energy source and organic compounds as a carbon source.
The structures indicated by the arrows in this photomicrograph are:
flagella at each pole (2) - correct answer-Bipolar flagella
Your body's microbes help "train" your immune system to know what to attack and what not
to. What happens when your immune system attacks a normally harmless food? - correct
answer-you have an allergic reaction
What percent of all the cells in the human body are bacterial cells? - correct answer-more
than 70%
What is a potential risk of taking too many antibiotics for infections? - correct
answer-antibiotics kill bacteria that keep us healthy
Where do most of the bacteria in your body live? - correct answer-in your large intestine
Every human has a different set of microbes. What accounts for these differences? - correct
answer-what you eat and who you live with
How do microbes keep us healthy? - correct answer-they produce vitamins and boost our
immune system
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