1. A (n) ________________ is a living thing that can only be seen with magnification.
a. eukaryote
b. heterotroph
c. microorganism
d. placozoan |
| Answer: c |
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2. What is a small mass of bacteria on an agar medium that resulted from the reproduction of one cell?
a. an aggregate
b. a colony
c. a growth
d. a tumor |
| Answer: b |
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3. What is the purpose of a streak plate?
a. to isolate bacteria by spreading them across a medium-filled Petri dish
b. to keep the microorganism cultures at the optimum temperature
c. to make microorganisms more visible to the naked eye
d. to show differences in specific types of bacteria |
| Answer: a |
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4. Most bacteria are:
a. consumers
b. decomposers
c. producers
d. scavengers |
| Answer: b |
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5. What are not cellular and consist of genetic information in the form of DNA or RNA protected by a protein capsid?
a. bacteria
b. fungi
c. Protista
d. viruses |
| Answer: d |
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Which of the following is related to harmful microbial activity?
a)fermentation
b)pathogenic microorganisms
c)probiotics
d)soil symbionts
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| Answer: b |
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How are bacteria commonly cultured for study?
a)in a water bath with symbiotics
b)in specially designed fermenters
c)on the food to which it is adapted
d)on the surface of an agar medium
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| Answer: d |
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A lab technician seeks to purify media for culture. Which method is the best choice?
a)disinfection
b)filtration
c)fumigation
d)sterilization
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| Answer: b |
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How can the isolation or separation of bacteria be achieved?
a)through aseptic technique
b)through microbial segregation
c)through serial dilution
d)through successive filtration
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| Answer: c |
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How can scientists differentiate bacteria and make them more distinguishable for study?
a)by adding chemical stains
b)through colony reduction
c)via selective disinfection
d)with a stainless nichrome wire
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| Answer: a |
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What is the purpose of dividing bacteria by a specific staining procedure called the Gram stain?
a)to detect positive charges
b)to spot peptidoglycan
c)to tell the bacteria apart
d)to produce more colonies
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| Answer: c |
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What is the class of rod shaped bacteria?
a)bacilli
b)cocci
c)spirillum
d)streptococci
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| Answer: a |
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What type of bacteria use chemical reactions for food production?
a)chemoautotrophic
b)chemoheterotrophic
c)photosynthetic
d)phototrophic
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| Answer: a |
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Archaea are unicellular prokaryotic microorganisms that are significantly different biochemically from bacteria. Which type of archaea live at very cold temperatures?
a)acidophiles
b)halophiles
c)hyperthermophiles
d)psychrophiles
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| Answer: d |
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How is algae classified?
a)archaea
b)bacteria
c)protist
d)yeast
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| Answer: c |
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