Exam 24: Early Life and the Diversification of Prokaryotes

Please use the following information to answer the question(s)below. A hypothetical bacterium swims among human intestinal contents until it finds a suitable location on the intestinal lining.It adheres to the intestinal lining using a feature that also protects it from bacteriophages and dehydration.Fecal matter from a human in whose intestine this bacterium lives can spread the bacterium,even after being mixed with water and boiled.The bacterium is not susceptible to the penicillin family of antibiotics.It contains no plasmids and relatively little peptidoglycan. -What should be true of the cell wall of this bacterium?

Certain proteins of the complex motor that drives bacterial flagella are modified versions of proteins that had previously belonged to plasma membrane pumps.This evidence supports the claim that

The table depicts characteristics of five prokaryotic species (A-E).Use the information in the table to answer the following question(s). Table 24.1 -Which species in Table 24.1 should be able to respond most readily to taxes (plural of taxis)?

The interactions of prokaryotes with humans are

In general,what is the primary ecological role of prokaryotes?

Fossilized stromatolites

If all prokaryotes on Earth suddenly vanished,which of the following would be the most likely and most direct result?

Which statement about the domain archaea is true?

Suppose bacteria are grown on a petri dish that contains nutrient agar and the antibiotic ampicillin.After observing the bacteria growth on the plate for two days,you notice that only some of the bacteria have survived.What is a plausible explanation for your observations?

Mycoplasmas are bacteria with the rare structural feature that they do not have cell walls.On the basis of this fact,which statement concerning mycoplasmas should be true?

Thiobacillus ferrooxidans is a type of bacteria that oxidizes iron compounds for energy and then uses that energy to build carbohydrates.We might best recognize this bacterium as the rust-colored ring that builds up inside toilet bowls.Thiobacillus ferrooxidans is an example of a

Please use the following information to answer the question(s)below. A hypothetical bacterium swims among human intestinal contents until it finds a suitable location on the intestinal lining.It adheres to the intestinal lining using a feature that also protects it from bacteriophages and dehydration.Fecal matter from a human in whose intestine this bacterium lives can spread the bacterium,even after being mixed with water and boiled.The bacterium is not susceptible to the penicillin family of antibiotics.It contains no plasmids and relatively little peptidoglycan. -This bacterium's ability to survive in a human who is taking penicillin pills may be due to the presence of which of the following? 1)penicillin-resistance genes 2)a gram-positive cell wall 3)a gram-negative cell wall 4)an endospore

The first genes on Earth were probably

The structure of a prokaryotic ribosome is not the same as a ribosome in an animal cell.As a result,which of the following is correct?

The table depicts characteristics of five prokaryotic species (A-E).Use the information in the table to answer the following question(s). Table 24.1 -Which two species in Table 24.1 should have much more phospholipid,in the form of bilayers,in their cytoplasm than most other bacteria?

Figure 24.2 depicts changes to the amount of DNA present in a recipient cell that is engaged in conjugation with an Hfr cell.Hfr cell DNA begins entering the recipient cell at time A.Assume that reciprocal crossing over occurs (in other words,a fragment of the recipient's chromosome is exchanged for a homologous fragment from the Hfr cell's DNA).Use Figure 24.2 to answer the following question(s). Figure 24.2 -How is the recipient cell different at time D than it was at time A?

The cell also lacks F factors and F plasmids.Which mechanism(s)of genetic recombination can possibly take place? 1)conjugation 2)transduction 3)transformation

The table depicts characteristics of five prokaryotic species (A-E).Use the information in the table to answer the following question(s). Table 24.1 -Which species in Table 24.1 is most self-sustaining in terms of obtaining nutrition in environments containing little fixed nitrogen or carbon?

According to scientists' hypotheses,prokaryotes most likely evolved prior to eukaryotes because

Why can prokaryotic population numbers be magnitudes larger than populations of multicellular eukaryotes?