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