Exam 15: Bacteria and Archaea

Ben drinks directly out of a new milk container and then leaves the milk out of the refrigerator for at least an hour before remembering to put it away.The next morning,his roommate complains that the milk he just bought has already turned sour.Why did the milk turn sour more quickly than usual?

Explain why the growth curve shown in the figure below changes from a relatively flat line to a steeper upward line as the generation number increases.

Which of the following organisms found in the human microbiome is NOT known to be a pathogen?

Small loops of extra DNA in the cytoplasm of prokaryotes are called

Prokaryotes may pick up pieces of DNA from the environment or other bacteria and incorporate these pieces into their own genome through

Escherichia coli,a bacterium that normally lives in the gut of humans,will have the shortest generation time when it is found

Compared to the domain Bacteria,the domain Archaea tends to live

What is the phenomenon referred to as dysbiosis? What problems may occur as a result of dysbiosis?

Plaque that form on the surface of teeth are an example of a(n)________.

If the generation time for the bacterium shown in the figure below is 30 minutes,how much time will have gone by when the population has reached 1,000?

Which of the following prokaryotes would be MOST likely to survive a full year in a freezing arctic tundra?

A prokaryote living in a hot hydrothermal vent deep in the ocean is most likely a(n)________.

Individuals who participate in research as experimental subjects are

Which of the following pairs of domains are MOST closely related?

Anaerobic archaeans living in hydrogen-rich environments may feed on hydrogen and release ________ gas as a by-product.

Eukaryote cells require hours for mitosis to occur.Prokaryotes can often divide into two cells in 10-30 minutes.What cell characteristics explain the difference in the length of time required for division?

The generation time for a prokaryote is 30 minutes.If one cell is present on a petri dish,how many cells will be present after three hours?

If one forgets to brush his or her teeth,bacteria may use ________ to attach onto the surface of the teeth.

Archaea are able to live in extreme environments because they have

Microbes that make up the domains Bacteria and Archaea are most similar in their