12 Jun Highland BS203 – You streak an unknown sample
ou streak an unknown sample and after incubation you see some red colonies and some yellow. What can you interpret from this experiment? Select one:
a. Likely started with a pure cultureb. A spread plate would work betterc. You have identified Enterobacter aerogenesd. You have identified Serratia marcescense. Likely started with a mixed culture
Question 22
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Why is the glass rod in the spread plate method put in alcohol and ignited instead of sterilized like a flame loop? Select one:
a. Glass oxidizesb. Glass meltsc. Glass takes longer to coold. Glass burnse. Glass is more sterile
Question 23
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What would likely occur if the flame loop was not sterilized between streaks on the quadrant streak method? Select one:
a. Bacteria will not stick to the loopb. Virus will be introducedc. Flame loop will be too hotd. The sample will be contaminatede. Subsequent streaks would have more colonies
Question 24
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True or false: Most colonies can been seen without aid (naked eye), and most single cells cannot be seen without a microscope. Select one:
TrueFalse
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