Exam 15: Bacteria and Archaea

List three characteristics shared between bacteria and archaea.

In some cases,science is advanced when the public participates in collecting,and sometimes analyzing,data.Name one way in which citizen scientists benefit from this type of collaborative effort.

As shown in the figure below,a single bacterium has a generation time of 10 minutes.Approximately how much time will have passed when the population is 100 cells?

After boiling water for a short period of time,the water is checked for the presence of living cells.When it is determined that no active,living cells are present,the water is used to make agar,a media used for bacterial growth.Within 48 hours there are numerous colonies of cells growing on the agar.What type of prokaryote is growing? Why was the organism not detected in the water?

Which of these comparisons is correct?

Prokaryotes have an optimum temperature for growth.If a prokaryote can divide into two cells every 20 minutes when the temperature is 37^oC,what would happen if the temperature dropped to 35^oC?

Many bacteria have a shorter generation time at warmer temperatures.Why do food safety guidelines recommend rapidly cooling leftover foods and maintaining them at refrigerator temperatures?

Archaeans known as halophiles would most likely be found living in a(n)

A disease-causing bacterium may be protected from the immune system by a slippery

An experiment is designed to test whether plants grow better in a sterile environment free of bacteria than they do in environments with bacteria.The soil,growing containers,and all materials are sterilized and seeds are planted.The seeds sprout but all of the seedlings die very quickly from nitrogen deficiency.Why?

A biofilm within a medical device is formed by several bacteria species.A bacterium that is part of this biofilm has a mutation that prevents the formation of the slimy secretion used to protect a developing biofilm.Will this mutation prevent the formation of the biofilm?

A bacterium that normally resides on human skin and does not cause disease has a very short generation time compared to disease-causing bacteria.How might this short generation time be beneficial to the human?

Structures produced by bacteria,but not archaeans,that are extremely resistant to boiling and freezing temperatures are

Prokaryotes typically reproduce by splitting in two through a process called ________.

Archaeans are often referred to as "extremophiles" because they are

Bacteria and archaea are both classified as

An individual with a deep,closed belly button is more likely to have more ________ bacteria living in his or her belly button compared to an individual with a shallow,open belly button.

Explain how bacteria can incorporate a gene for antibiotic resistance from another bacterial cell.

An experiment is performed to see if an antiseptic will change the skin microbiome.Skin swabs are used before an antiseptic is applied,after the antiseptic is applied,and on the same area 48 hours later.It is observed that the antiseptic drastically reduced the numbers of Staphyloccocus and other bacteria.After 48 hours Staphylococcus reappears as the most common species.What can be inferred from these results?

Citizens use an app to document the location of ash trees in their community.These citizen scientists are participating