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Microbiology Lab Final Exam Version 3 Actual Exam Newest 2025-2026 Complete All Questions And Correct Detailed Answers (Verified Answers) |Already Graded A+||Brand New Version!
Match the bacterial species listed below with the correct Gram reaction.
- ANSWER-Bacillus megaterium: Gram positive
Staphylococcus epidermidis: Gram positive
Escherichia coli: Gram negative
Which staining technique is the quickest way to determine the cell morphology of bacteria? - ANSWER-Simple stain
What is the cellular morphology of spherical-shaped bacterial cells? - ANSWER-Cocci (or coccus)
What is the definition of an indirect method for enumerating bacteria? - ANSWER-Estimating the number of bacteria based on metabolic tests or other growth characteristics
Match each acronym with its meaning. - ANSWER-TNTC: Too
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NSS: Not Statistically Significant
CFU: Colony Forming Units
What is the acceptable range for counting colonies on plates in the bacterial enumeration exercise? - ANSWER-30 to 300 colonies per plate
What is the purpose of re-streaking your environmental unknown? - ANSWER-To isolate a single species of bacteria and to keep it alive
There are 229 colonies on the 10-5 dilution plate. This is equivalent to...
- ANSWER-2.29 X 107 CFU/g
What is the definition of a direct method for enumerating bacteria? - ANSWER-Counting individual bacterial cells
What is the purpose of a serial dilution in a viable plate assay? Select all correct answers. - ANSWER-The amount of bacteria in the original sample is unknown, and at least one plate needs to have a countable number of colonies The serial dilution allows us to calculate the amount of bacteria in the original sample The serial dilution allows bacteria to undergo exponential growth Bacteria need a liquid medium to reproduce
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