microbiology Mastering Ch 6 – Flashcards
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Which of the following classes of microorganisms would have an optimum growth rate at 62°C?
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Thermophiles
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Aerobic bacteria that have developed (or retain) the ability to continue growing in the absence of molecular oxygen () are called:
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facultative anaerobes.
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Which of the following statements regarding biofilms is false?
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Fortunately, biofilms are not an issue that impacts human health.
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What results when a single bacterium reproduces?
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Two genetically identical daughter cells
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If you begin with six cells, how many cells would you have after three rounds of division?
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48
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Which of the following is NOT a step in bacterial cell division?
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Disappearance of nuclear envelope
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Which step of binary fission is the reason for genetically identical daughter cells?
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Replication of the bacterial chromosome
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What enables the copied chromosomes to separate during binary fission?
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The chromosomes are attached to different parts of cell membrane, which elongates and thus separates the chromosomes.
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How long does it take for the daughter cells from one round of replication to replicate themselves?
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No time is required -- they are fully mature and ready to divide immediately after separation if conditions are right.
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Put the following steps of bacterial replication in the correct order, starting from a parent cell.
Cell elongation
Septum formation
Chromosome replication
Separation of daughter cells
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3, 1, 2, 4
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What would happen if the septum did not form during binary fission?
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The parent cell would now have two copies of the chromosome.
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Starting with three cells, how many cells would result from three rounds of replication?
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24
