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Microbiology Midterm Questions and Answers (Q&A)

Semiconservative replication refers to the mechanism by which DNA is replicated in all known cells. It produces two copies that each contain one of the original strands and a new strand. This process creates enough genetic information to divide among two cells when cell division occurs. It begins when DNA consisting of two strands of complementary genetic information separates. Once separation is accomplished, complements to each old strand of DNA form and take the place of the sides that are missing.

It takes place during the stage of the cell life cycle called S phase. In the S phase, the cell goes through growth that makes the proteins able to perform replication. Once the DNA is replicated, the cell goes through another growth phase before it begins division. Division of the cells occurs during mitosis. Once it goes through mitosis, the process starts again.

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Exactly what is a microaerophile? It is a microorganism (very small) that requires oxygen but lives in an environment where there is very little oxygen. One place where the environment is right for this microorganism to exist is to light a candle in a jar and then sealing the jar with an airtight lid. The candle will burn until it is deprived of oxygen. This creates a carbon dioxide environment.

The reason microaerophiles need oxygen is that they cannot ferment or respire otherwise. If they have high concentrations of oxygen they are poisoned. They don’t necessarily grow best in an anaerobic jar. One example of the microaerophile is the campylobacter which it is categorized as a bacteria. Those animals that have campylobacter can make humans very sick.

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