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CCRI MICRO EXAM 2 VITO
QUESTIONS AND ANSWER S WITH
VERIFIED STUDY QUIZ
Question : Chlorine and iodine are classified as
CORRECT ANSWER: halogens
Question : Obligate aerobes can only live
CORRECT ANSWER : when oxygen is present
Question : Microorganism found thriving in a the
permafrost region of the Arctic are
CORRECT ANSWER : pychrophiles
Question : Facultative halophiles
CORRECT ANSWER: tolerate an elevated salt
concentration in the environment
Question : Most bacteria prefer to grow at which pH
range?
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CORRECT ANSWER : Most bacteria prefer to grow at
which pH range?
Question : The spectrophotometer is used in microbiology
to
CORRECT ANSWER : indirectly measure microbial
growth
Question : Pyrimidine dimers are formed in DNA when
DNA
CORRECT ANSWER : absorbs UV radiation
Question : These microorganisms are anaerobic but can
live in the presence of oxygen even though they do not actually use the oxygen
CORRECT ANSWER : aerotolerant
Question : Which statement is true concerning penicillin?
CORRECT ANSWER : it destroys the cell wall of
bacteria by breaking down peptidoglycan
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Question : A type of antibiotic that injures the plasma
membranes is
CORRECT ANSWER : polymyxin B
Question : This type of bacteria is most likely to spoil
refrigerated food
CORRECT ANSWER : psychrotrophs
Question : Cultures of a bacterial species were incubated
on the shelf of a refrigerator, out on a lab bench top, on the shelf of a 37° C incubator and on the shelf of a 50° C incubator. After incubation, there was no growth at 37° C and 50° C, slight growth out on the bench top, and abundant growth at refrigeration. What term could be used for this species?
CORRECT ANSWER : psychrotroph
Question : Most human diseases are caused these
microorganisms
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CORRECT ANSWER : mesophiles
Question : A microorganism that does not have the
enzymes catalase or superoxide dismutase would find it difficult to live in an environment with
CORRECT ANSWER : oxygen
Question : Which antibiotic binds to the 50s portion of the
ribosome and inhibits the formation of the peptide bond?
CORRECT ANSWER : chloramphenicol
Question : Microorganisms living around deep sea
hydrothermal vents are classified as